Advance indeed paid in (9)
I believe the answer is:
deposited
'advance indeed paid in' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs sometimes define each other.
'advance indeed paid in' is the wordplay.
'advance' becomes 'posit' (both can mean to put forward or suggest).
'indeed paid' becomes 'deed' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'posit' inserted inside 'deed' is 'DEPOSITED'.
Can you help me to learn more?
(Other definitions for deposited that I've seen before include "Laid down naturally (like silt)" , "Banked" , "left" , "put away" .)