Fairly matched (4)
I believe the answer is:
even
'fairly matched' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for even that I've seen before include "Crisp and ---, how King Wenceslas found the snow" , "Deep crisp snow seen on Boxing Day also this" , "Peaceful" , "Short joke" , "Nearly" .)