Soccer body supported by the others is most equitable (7)
I believe the answer is:
fairest
'most equitable' is the definition.
('fair' can be a synonym of 'equitable')
'soccer body supported by the others' is the wordplay.
'soccer body' becomes 'FA'.
'supported by' says to put letters next to each other (in a down clue, some letters hold up others).
'the others' becomes 'irest' (I can't justify this - if you can you should believe this answer much more).
'fa'+'irest'='FAIREST'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for fairest that I've seen before include "'''Mirror, mirror on the wall, who is the ... of them all'' (Snow White's stepmother) (7)'" , "Very lovely" , "Most beautiful" .)