Squeeze into a ball (7)
I believe the answer is:
scrunch
'squeeze into a ball' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for scrunch that I've seen before include "Crumple" , "Make a crushing noise" , "Crush, squeeze" , "Loud noise of crushing" , "Sound of packing snow, say" .)