Hired bar from bartender (6)
I believe the answer is:
rented
'hired' is the definition.
('rent' can be a synonym of 'hire')
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for rented that I've seen before include "Let for money" , "Leased" , "Taken for hire" , "Hired - tender (anag)" .)