Sooooooooooo, I think I know what I want to do. I think I know what I need to do. I'm not sure I know how to do it! I'm not even sure I know how to explain it!!! Time to get even vaguer! 
 
I have a voice clip that is c. 5 seconds long. On this project, I have processed it so it is now in reverse (having made a copy of it). The reversed version starts at 1:12:26 and ends at 1:17:04 (track BPM is 56 if that helps?). The 'normal' version starts at 1:42:26 and ends at 1:47:04.
 
What I'm after is that as the reversed version plays at the beginning, it all gets messed up as the clip progresses and for the space between the clips (1:17:04 - 1:42:26) it is just noise produced from the clip, then is slowly morphs into the 'normal' version at 1:42:26. Clear as mud!! 
 
I'm assuming I just need to chuck a load of reverb and delays at it? Maybe build an FX chain so that I can automate the 'weirdness' fading in, then out, when required? I did attempt the reverb and delay method briefly but didn't get far.
 
As you can tell, it's all a bit vague. With regards to plugins at my disposal, I have Waves Gold, all the usual Sonar ones from X1/X2/X3/Platinum, Stillwell, some CLA stuff, plenty of bits and bobs to play with.
 
Anyone got this far and understood the above? If so, any ideas?
 
Cheers 

Yes, it's hard to describe those kinds of things, so my reply may well be based on a complete misunderstanding of what you said. But my interpretation is that you want a reversed version to lead smoothly into the straight version, perhaps with additional effects on the reversed copy.
 
The way I do this is to clone the clip, usually to a second track for convenience. Then I apply reverb (usually pretty thick) to the clone (BEFORE reversing it). I usually automate the reverb so that it gets louder toward the end of the clip, and may add a subtle phaser or chorus. Then, when you reverse it, you hear the reverb tail first and the vocal gradually gets clearer just as it morphs into the un-reversed clip.
 
Fades at the end of the reversed clip and start of the dry clip make it hard to tell when one ends and the other begins. You have to experiment with different lengths for the fades to find the morph rate that sounds right. You also have the option of re-applying reverb to the reversed clip to further aid the transition.
 
Anyhow, that's how I do it. Hopefully it's relevant to your question.

If there's enough time between the clips to make it work a delay with decreasing time and increasing feedback can sometimes work, especially if it's a delay that does the analogue thing of the pitch rising as the delay time shortens or has a pitch shift on the wet signal that is controlled by an envelope.

Used together with the kind of processing bitflipper suggests can be quite effective. Adding distortion or filtering as the sound goes on can be effective as well.

Thank you both kindly chaps!! The increased delay with reversed reverb worked a treat. For something which was a bit gobbledygook, reading back my initial post, you've both worked wonders!! Thanks