Servant providing legal consideration (8)
I believe the answer is:
retainer
This clue might be a double definition.
'servant' is the first definition.
('retainer' can be a synonym of 'servant')
'legal consideration' is the second definition.
'retainer' can be an answer for 'consideration' ('retainer' can be a synonym of 'consideration'). I'm not certain of the 'legal' bit.
'providing' acts as a link.
Can you help me to learn more?
(Other definitions for retainer that I've seen before include "Part payment down for an old servant" , "Fee paid for first option - old family servant" , "A money deposit or an old servant" , "Faithful old servant - maybe Eritrean" , "Fee paid to book the services of someone" .)