Suit to get on (5)
I believe the answer is:
agree
I believe this clue is a double definition.
'suit' is the first definition.
(I know that agree is a more specific form of the action suit)
'get on' is the second definition.
(I've seen this before)
'to' acts as a link.
(Other definitions for agree that I've seen before include "Accept" , "'Assent, concur (5)'" , "share the same view" , "Hold the same view" , "Eager (anag)" .)