Do better than another in competition (4)
I believe the answer is:
beat
'do better than another in competition' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for beat that I've seen before include "Policeman's round" , "Rhythmic music unit" , "Worst round" , "Police officer's allocated area to be patrolled" , "Thrash, punish physically" .)