Unsettled feud revolutionary carries over (7)
I believe the answer is:
overdue
'unsettled' is the definition.
(I've seen this before)
'feud revolutionary carries over' is the wordplay.
'carries' says the answer is hidden in the clue.
'over' says the letters should be written backwards.
'eudrevo' is hidden within 'feud revolutionary'.
'eudrevo' backwards is 'OVERDUE'.
(Other definitions for overdue that I've seen before include "Belated" , "Behindhand" , "Remaining unpaid after the scheduled time" , "Late for payment" , "Not paid by the appropriate time" .)