Beer is drunk by the lady with courage for party game (4,3,6)
I believe the answer is:
spin the bottle
'for party game' is the definition.
(I've seen this before)
'beer is drunk by the lady with courage' is the wordplay.
'beer' becomes 'pint' (beer is typically served by the pint).
'is drunk by' is an insertion indicator.
'the lady' becomes 'she' ('she' refers to a woman).
'with' says to put letters next to each other.
'courage' becomes 'bottle' (bottle can mean courage).
'pint' inserted within 'she' is 'spinthe'.
'spinthe'+'bottle'='SPIN-THE-BOTTLE'
(Other definitions for spin the bottle that I've seen before include "drinking game" , "party game" , "daring game" .)