Crossword Genius

Game involving some loss of blood? (3)


I believe the answer is:


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'game' is the definition.
(historical card game)

'some loss of blood?' is the wordplay.
'LOO' is hidden within the letters.
However, I am unsure how this is indicated.

'involving' is the link.

Can you help me to learn more?

(Other definitions for loo that I've seen before include "Ladies, perhaps" , "Little boys' room" , "In which one goes" , "Card-game" , "Privy" .)

I've seen this clue in the Evening Standard.
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