Overtures returned with interest? (8)
I believe the answer is:
advances
'overtures' is the definition.
('advance' can be a synonym of 'overture')
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for advances that I've seen before include "Moves or puts forward" , "Moves forwards in a purposeful way" , "Amounts paid before they're earned" , "Loand - or amorous approaches" , "Loans" .)