Support for member to pay balance (8)
I believe the answer is:
footrest
'support for member' is the definition.
'pay balance' is the wordplay.
'pay' becomes 'foot' (footing is a kind of paying).
'balance' becomes 'rest' (I've seen this before).
'foot'+'rest'='FOOTREST'
'to' is the link.
(Other definitions for footrest that I've seen before include "Supporter" , "Sitter's leg support" , "Support for legs" , "Support for sitter" , "Stool, perhaps" .)