An instructive guide for the fellows on the hill (6)
I believe the answer is:
mentor
'an instructive guide' is the definition.
'mentor' can be an answer for 'guide' (I've seen this in another clue). I am not sure about the 'an instructive' bit.
'fellows on the hill' is the wordplay.
'fellows' becomes 'men' (fellow can mean a man).
'on' means one lot of letters go next to another.
'the hill' becomes 'tor' (tor is a kind of hill).
'men'+'tor'='MENTOR'
'for the' acts as a link.
Can you help me to learn more?
(Other definitions for mentor that I've seen before include "Coach" , "Merton (anag.)" , "One guiding" , "A trusted teacher or counsellor" , "Guru" .)