Discharge returned bill first, producing capital (5)
I believe the answer is:
accra
'capital' is the definition.
(Accra is an example)
'discharge returned bill first' is the wordplay.
'discharge' becomes 'arc' ('arc' can be a synonym of 'discharge').
'returned' shows that the letters should be reversed in order.
'bill' becomes 'ac'.
'first' says to put letters next to each other.
'arc' backwards is 'cra'.
'cra' put after 'ac' is 'ACCRA'.
'producing' is the link.
(Other definitions for accra that I've seen before include "Largest city of Ghana" , "Capital city of Ghana" , "West African capital" , "foreign capital" , "Ghana's capital" .)