Gambling card game (3)
(Other definitions for loo that I've seen before include "Card game; the 'smallest room'" , "bog" , "Toilet (informal)" , "Lavatory - old card game" , "The little room - card game" .)
'gambling card game' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for baccarat that I've seen before include "French card game" , "Casino card-game" , "Card game in which punters gamble against the banker" , "game of cards" , "Casino card game" .)