Most equitable (7)
I believe the answer is:
fairest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">most equitable</span>' is the definition.<br/ ><span class="explanation-format__explanation">('fair' can be a synonym of 'equitable')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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)'" .)