Group outside bar turned up to see game (6)
I believe the answer is:
tennis
'game' is the definition.
(tennis is a kind of game)
'group outside bar turned up' is the wordplay.
'group' becomes 'set' (set is a kind of group).
'outside' indicates putting letters inside.
'bar' becomes 'inn' (I've seen this before**).
'turned up' is a reversal indicator.
'set' placed around 'inn' is 'sinnet'.
'sinnet' reversed gives 'TENNIS'.
'to see' is the link.
(Other definitions for tennis that I've seen before include "Game of the Williams sisters and of Roger Federer" , "McEnroe's game" , "- elbow; - shoe" , "court contest" , "Medieval, originally French, sport, codified by the British" .)