Favour one make (6)
I believe the answer is:
oblige
I believe this clue is a double definition.
'favour one' is the first definition.
(favour can mean to oblige or please someone)
'make' is the second definition.
(as in being obliged to do something)
(Other definitions for oblige that I've seen before include "Hold in debt" , "Make" , "serve" , "Compel, force" , "Put oneself out for" .)