Fee for servant (8)
I believe the answer is:
retainer
I believe this is a double definition.
'fee' is the first definition.
(retainer is a kind of fee)
'servant' is the second definition.
('retainer' can be a synonym of 'servant')
'for' acts as a link.
(Other definitions for retainer that I've seen before include "The keeper" , "Advance fee to reserve someone's services" , "Fee paid to book the services of someone" , "Down-payment for Eritrean" , "Holding fee or faithful old servant" .)