Equitable, just (4)
I believe the answer is:
fair
I believe this is a double definition.
'equitable' is the first definition.
(synonyms)
'just' is the second definition.
(just can mean fair in the sense of showing justice)
(Other definitions for fair that I've seen before include "Favourable" , "... enough! - that's reasonable" , "Light coloured" , "Blonde; beautiful" , "'Show, exhibition, market (4)'" .)