Grace perhaps of one settling debt, concealing resistance (6)
I believe the answer is:
prayer
'grace perhaps' is the definition.
(I know that Grace is a type of prayer)
'one settling debt concealing resistance' is the wordplay.
'one settling debt' becomes 'payer' (someone paying a debt).
'concealing' is an insertion indicator.
'resistance' becomes 'r' (electronics abbreviation).
'payer' placed around 'r' is 'PRAYER'.
'of' acts as a link.
(Other definitions for prayer that I've seen before include "Address to god" , "Supplication [ital]" , "Earnest hope" , "Collect - petition" , "Paternoster, for example" .)