Best hit (4)
I believe the answer is:
beat
I believe this clue is a double definition.
'best' is the first definition.
(I've seen this before)
'hit' is the second definition.
(Other definitions for beat that I've seen before include "Come out better than in a competition" , "Throb; surpass" , "club" , "Overcome or hit repeatedly" , "Get the better of in competition" .)