Press into folds (5)
I believe the answer is:
crimp
'press into folds' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for crimp that I've seen before include "Bend into shape" , "wave" , "Connect by squeezing together" , "Fold or press into ridges" , "Compress into small folds or ridges" .)