Irritable seeing account not closed over debts (7)
I believe the answer is:
Here is my best explanation:
'irritable' is the definition.
'seeing account not closed over debts' is the subsidiary indication.
'seeing account' becomes 'bill' (billing is a kind of accounting).
'not closed' means to remove the last letter.
'over' says to put letters next to each other.
'debts' becomes 'ious'.
'bill' with its last letter taken off is 'bil'.
(Other definitions for bilious that I've seen before include "Liverish - irritable", "feeling sick", "Affected by nausea", "Affected by illness, yellowgreen?", "Affected by illness, or just bad-tempered", "Bad-tempered or maybe just sick", "Queasy", "Showing irritation", "Caused by excessive secretion from the liver" and "Nauseated; irritable".)