Change may be converted later (5)
I believe the answer is:
alter
'change' is the definition.
('alter' can be a synonym of 'change')
'converted later' is the wordplay.
'converted' indicates an anagram.
'later' is an anagram of 'ALTER'.
'may be' is the link.
(Other definitions for alter that I've seen before include "Metamorphose" , "convert" , "Alert to change" , "Vary" , "Become different" .)