Equally matched (4)
I believe the answer is:
even
'equally matched' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for even that I've seen before include "Describes a number divisible by two" , "Placid - not easily angered" , "Stable" , "Level, equal" , "time when sun goes down for the poet" .)