Beat; get the better of (5)
I believe the answer is:
outdo
I believe this clue is a double definition.
'beat' is the first definition.
(I know that outdo is a type of beat)
'get the better of' is the second definition.
(I know that outdo is a type of trounce)
(Other definitions for outdo that I've seen before include "Go one beter than, surpass" , "Perform better than surpass" , "Eclipse" , "Beat" , "Surpass - overshadow - excel" .)