Uniform that's reversible? (5)
I believe the answer is:
level
This clue is a double definition.
'uniform' is the first definition.
(thesaurus)
'reversible?' is the second definition.
'that's' acts as a link.
(Other definitions for level that I've seen before include "Absolutely horizontal" , "Neither winning, nor losing" , "Palindromic tier?" , "status" , "Balanced" .)