Do go back with debts; It’s disgusting (6)
I believe the answer is:
odious
'disgusting' is the definition.
(I've seen this in another clue)
'do go back with debts' is the wordplay.
'go back' shows that the letters should be reversed in order.
'with' is a charade indicator (letters next to each other).
'debts' becomes 'IOUs' (promises to pay debts).
'do' reversed gives 'od'.
'od'+'ious'='ODIOUS'
'it's' is the link.
(Other definitions for odious that I've seen before include "Hateful, generally despised" , "Disagreeable" , "Contemptible" , "Comparisons are said to be thus" , "Hateful, really nasty" .)