Striking single, move faster than opponent (6)
I believe the answer is:
outrun
'move faster than opponent' is the definition.
'striking single' is the wordplay.
'striking' becomes 'out' (striking out is a common phrase).
'single' becomes 'run' (cricket).
'out'+'run'='OUTRUN'
(Other definitions for outrun that I've seen before include "Overtake, escape" , "Go faster than as in foot race" , "Go faster than, on the gallop" , "Be too fast for on foot" , "Lose" .)