Different from shape (4)
I believe the answer is:
form
'shape' is the definition.
(I know that shape can be written as form)
'different from' is the wordplay.
'different' is an anagram indicator (letters placed in a different order).
'from' is an anagram of 'FORM'.
(Other definitions for form that I've seen before include "Make" , "Fitness" , "Class - hare's home" , "Home of a hare" , "A hare's hide-out" .)