Advance position showing solidity (9)
I believe the answer is:
substance
'solidity' is the definition.
(thesaurus)
'advance position' is the wordplay.
'advance' becomes 'sub' (both can mean a loan).
'position' becomes 'stance' (stance is a kind of position).
'sub'+'stance'='SUBSTANCE'
'showing' is the link.
(Other definitions for substance that I've seen before include "wealth" , "Physical matter" , "Physical material" , "Subject matter" , "Basic matter" .)