A bit of fun, if you come together (5)
I believe the answer is:
unify
'come together' is the definition.
(I've seen this in another clue)
'a bit of fun if you' is the wordplay.
'a bit of' says the answer is hidden in the clue.
'UNIFY' is hidden within 'fun if you'.
(Other definitions for unify that I've seen before include "Amalgamate" , "Bring together" , "Federate" , "Join into one" , "Combine" .)