11 across
Where
peers
congregate
for
game
of
cards
(3)
Where peers congregate for game of cards (3)
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The definition is at the beginning of the clue.
How the clue works
Two meanings are doing the work here, with no wordplay to untangle. Where peers congregate is a cheeky way of describing the toilet, with "peers" doing double duty as "pee-ers", while game of cards is simply the old card game of the same name. Both lead to the same three-letter word, so it's just a matter of spotting that the surface is hiding a pun.