Abandoned client unsettled by debts (10)
I believe the answer is:
licentious
'abandoned' is the definition.
(I've seen this before)
'client unsettled by debts' is the wordplay.
'unsettled' indicates an anagram.
'by' is a charade indicator (letters next to each other).
'debts' becomes 'IOUs' (promises to pay debts).
'client' is an anagram of 'licent'.
'licent'+'ious'='LICENTIOUS'
(Other definitions for licentious that I've seen before include "Depraved" , "Abandoned" , "disregarding accepted rules" , "Promiscuous" .)