Filling the place of another priest with evidence of debts (9)
I believe the answer is:
vicarious
'filling the place of another' is the definition.
I can't judge whether this defines the answer.
'priest with evidence of debts' is the wordplay.
'priest' becomes 'vicar' (vicar is a kind of priest).
'with' means one lot of letters go next to another.
'evidence of debts' becomes 'IOUs' (I Owe Yous, promises to pay debts).
'vicar'+'ious'='VICARIOUS'
Can you help me to learn more?
(Other definitions for vicarious that I've seen before include "Acting for others" , "Experienced at secondhand" , "Substitutionary" , "Indirect" , "Standing in for another" .)