Crossword Genius

Be unhappy, perhaps, as tenant’s picked up small revolver (8)

Ross

I believe the answer is:

roulette

'small revolver' is the definition.
(a roulette wheel revolves)

I don't understand how the remainder of the clue works.

(Other definitions for roulette that I've seen before include "Wheel of fortune" , "Half of 1D [GAME OR BIRD]" , "Gambling game with small ball and revolving disc (8)" , "Wheel for the gambler" , "Table game" .)

I've seen this clue in The Times.
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