It's even reversible (5)
I believe the answer is:
level
This clue is a double definition.
'it's even' is the first definition.
(synonyms)
'reversible' is the second definition.
(Other definitions for level that I've seen before include "Straight, even" , "Having a flat, horizontal surface" , "Absolutely horizontal" , "Neck and neck" , "Even; a plane" .)