Just average (4)
I believe the answer is:
fair
I believe this clue is a double definition.
'just' is the first definition.
(just can mean fair in the sense of showing justice)
'average' is the second definition.
(synonyms)
(Other definitions for fair that I've seen before include "Light coloured" , "Equitable ? - trade show" , "promotional exhibition" , "... enough! - that's reasonable" , "Reasonable - market" .)