Hateful debtor's notes follow overdraft (6)
I believe the answer is:
odious
'hateful' is the definition.
(similar in meaning)
'debtor's notes follow overdraft' is the wordplay.
'debtor's notes' becomes 'ious' (I've seen this in another clue).
'follow' is a charade indicator (letters next to each other).
'overdraft' becomes 'od'.
'ious' after 'od' is 'ODIOUS'.
(Other definitions for odious that I've seen before include "Hateful, really nasty" , "'Hateful, repulsive (6)'" , "Really obnoxious, generally disliked" , "Thoroughly obnoxious, hateful" , "Extremely unpleasant" .)