Afterwards alter shape (5)
I believe the answer is:
later
'afterwards' is the definition.
(I know that afterwards can be written as later)
'alter shape' is the wordplay.
'shape' indicates anagramming the letters.
'alter' anagrammed gives 'LATER'.
(Other definitions for later that I've seen before include "more modern" , "At a subsequent time" , "Tardier" , "succeeding" , "Alter (anag.)" .)