Come back to host a second game, perhaps (6)
I believe the answer is:
replay
'second game perhaps' is the definition.
(a re-match)
'come back to host a' is the wordplay.
'come back' becomes 'reply' (I've seen this before).
'to host' means one lot of letters goes inside another (inserted letters are hosted or welcomed).
'reply' placed around 'a' is 'REPLAY'.
(Other definitions for replay that I've seen before include "Repeated match" , "A restaged match" , "encore" , "kind of race" , "second game" .)