All right to go in for every game (5)
I believe the answer is:
poker
'game' is the definition.
(poker is a kind of game)
'all right to go in for every' is the wordplay.
'all right' becomes 'ok' (synonyms).
'to go in' means one lot of letters goes inside another.
'for every' becomes 'per' ('per' means 'for each' or 'for every').
'ok' put within 'per' is 'POKER'.
(Other definitions for poker that I've seen before include "One of many irons in the fire" , "See 1" , "Fire prodder; game" , "Fireside implement - card game" , "Stiff rod; card game" .)