Doubtful name for debts (7)
I believe the answer is:
dubious
'doubtful' is the definition.
('dubious' can be a synonym of 'doubtful')
'name for debts' is the wordplay.
'name' becomes 'dub' (**).
'for' is a charade indicator (letters next to each other).
'debts' becomes 'ious'.
'dub'+'ious'='DUBIOUS'
(Other definitions for dubious that I've seen before include "Open to question" , "untrustworthy" , "Morally suspect" , "Uncertain - suspect" , "Arousing suspicion" .)