Moves fast in a game (5)
I believe the answer is:
darts
'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" .)