Game involving some loss of blood? (3)
I believe the answer is:
'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" .)