Shady card game (5)
I believe the answer is:
ombre
'card game' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for ombre that I've seen before include "Game using 40 cards" , "Card game, the name derived from the Spanish for man" , "Card-game for three; rob me (anag.)" , "Three-player card game" , "Card game for three" .)