Become crushed so as to crease and wrinkle (7)

I believe the answer is:
crumple
(Other definitions for crumple that I've seen before include "Pucker" , "Make wrinkled" , "Go to pieces" , "Crush (paper)" , "Crease" .)
I believe the answer is:
crumple
(Other definitions for crumple that I've seen before include "Pucker" , "Make wrinkled" , "Go to pieces" , "Crush (paper)" , "Crease" .)