Change shape later (5)
I believe the answer is:
alter
'change' is the definition.
('alter' can be a synonym of 'change')
'shape later' is the wordplay.
'shape' indicates anagramming the letters.
'later' with letters rearranged gives 'ALTER'.
(Other definitions for alter that I've seen before include "Make changes to" , "Amend" , "shift" , "Bout of extravagant spending" , "Change, maybe later" .)