Crossword Genius

Moves fast in a game (5)

Ross

I believe the answer is:

darts

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'game' is the definition.
(darts is a kind of game)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for darts that I've seen before include "Game with board and missiles" , "Moves along rapidly" , "Traditional pub game" , "Shoots" , "Tears" .)

I've seen this clue in the Evening Standard.
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