Salt in quota revised (3)
I believe the answer is:
tar
'salt' is the definition.
(both can informally mean a sailor)
'in quota revised' is the wordplay.
'in' indicates the answer is hidden within the clue.
'TAR' is hidden in the letters of 'quota revised'.
(Other definitions for tar that I've seen before include "Thick, black and sticky liquid" , "Sailor (colloq.)" , "Viscous liquid; sailor" , "Black substance in cigarettes" , "Informal sailor or coal distillation" .)