Be the equal of (5)
I believe the answer is:
rival
'be the equal of' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rival that I've seen before include "Emulate" , "Contender" , "Competitor; be as good as" , "Adversary or foe" , "Contestant you hope to defeat" .)