A fine and equitable business (6)
I believe the answer is:
affair
'business' is the definition.
(thesaurus)
'a fine and equitable' is the wordplay.
'a fine' becomes 'af' (I've seen this in other clues).
'and' means one lot of letters go next to another.
'equitable' becomes 'fair' ('fair' can be a synonym of 'equitable').
'af'+'fair'='AFFAIR'
(Other definitions for affair that I've seen before include "Singular business" , "Vaguely specified concern" , "A fling (or something more serious?)" , "Romantic relationship between two unmarried people" , "A matter; amorous episode" .)