Go out of shape (4)
I believe the answer is:
warp
'go out of shape' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for warp that I've seen before include "Distort, ship's rope" , "Pervert - distort" , "Distort, twist" , "'Bend out of shape, with heat say (4)'" , "Make or become out of shape" .)