Most equitable (7)
I believe the answer is:
fairest
'most equitable' is the definition.
('fair' can be a synonym of 'equitable')
This is all the clue.
(Other definitions for fairest that I've seen before include "Most beautiful" , "Very lovely" , "'''Mirror, mirror on the wall, who is the ... of them all'' (Snow White's stepmother) (7)'" .)