Mentored one (7)
I believe the answer is:
protege
'mentored one' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for protege that I've seen before include "Person who is helped or sponsored by another" , "One guided and supported by another" , "Pupil, follower" , "Pupil; ward" , "Male helped and protected by, say, patron" .)