Sudden quick movements in game (5)
I believe the answer is:
darts
I believe this clue is a double definition.
'sudden quick movements' is the first definition.
'game' is the second definition.
(darts is a kind of game)
'in' is the link.
(Other definitions for darts that I've seen before include "Game in which missiles are thrown at target" , "Shoots" , "Game with board and missiles" , "Game; moves quickly" , "Moves along rapidly" .)