Fee; servant (8)
I believe the answer is:
retainer
This clue is a double definition.
'fee' is the first definition.
(I know that retainer is a type of fee)
'servant' is the second definition.
(I know that servant can be written as retainer)
(Other definitions for retainer that I've seen before include "reduced rent" , "Fee paid to book professional services" , "given payment in advance" , "Fee paid to secure services" , "Old servant - fee paid in advance" .)