Market square (4)
I believe the answer is:
fair
I believe this is a double definition.
'market' is the first definition.
(both can mean a place where things are sold)
'square' is the second definition.
(I've seen this before)
(Other definitions for fair that I've seen before include "Equitable - market - not bad" , "... enough! - that's reasonable" , "legitimate" , "Unbiased, being light of skin" , "Blonde or equitable" .)