Tailor or suit (5)
I believe the answer is:
adapt
This clue is a double definition.
'tailor' is the first definition.
(thesaurus)
'suit' is the second definition.
(thesaurus)
'or' acts as a link.
(Other definitions for adapt that I've seen before include "match" , "get used?" , "Adjust (to changes)" , "Convert to another use or situation" , "Accommodate" .)