It's a tricky game (4)

I believe the answer is:

solo

I'm a little stuck... Click here to teach me more about this clue!

'game' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for solo that I've seen before include "Type of whist" , "By oneself" , "Alone - card game" , "Alone, unaccompanied" , "It's performed alone" .)

I've seen this clue in the Evening Standard.

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