Get suit (6)
I believe the answer is:
become
I believe this clue is a double definition.
'get' is the first definition.
('become' can be a synonym of 'get')
'suit' is the second definition.
('become' can be a synonym of 'suit')
(Other definitions for become that I've seen before include "Suit, befit" , "Grow to be" , "Undergo a change or development" , "Flatter" , "Develop into something" .)