Different from shape (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
form
'shape' is the definition.
('form' can be a synonym of 'shape')
'different from' is the wordplay.
'different' is an anagram indicator.
'from' with letters rearranged gives '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" .)