Time to come round about match (5)
I believe the answer is:
agree
'match' is the definition.
(agreeing is a kind of matching)
'time to come round about' is the wordplay.
'time' becomes 'age' (age is a kind of time).
'to come round' means one lot of letters goes inside another.
'about' becomes 're' (regarding**).
'age' going around 're' is 'AGREE'.
(Other definitions for agree that I've seen before include "Concur, coincide" , "suit" , "Square" , "Be of one mind" , "chime?" .)