Vicar with debts, in work steadily until now (10)

'until now' is the definition.

'vicar with debts in work steadily' is the wordplay.
'vicar' becomes 'rev' (reverend).
'with' means one lot of letters go next to another.
'debts' becomes 'IOUs' (promises to pay debts).
'in' means one lot of letters goes inside another.
'work steadily' becomes 'ply' (as in plying one's trade).
'rev'+'ious'='revious'
'revious' put within 'ply' is 'PREVIOUSLY'.