A boss who makes a fellow feel old? (7)
I believe the answer is:
manager
'a boss who' is the definition.
'manager' can be an answer for 'a boss' (I've seen this in another clue). I am not certain of the rest of the definition.
'a fellow feel old?' is the wordplay.
'a fellow' becomes 'man' (fellow can mean a man).
'feel old?' becomes 'ager' (I am not sure about this - if you are sure you should believe this answer much more).
'man'+'ager'='MANAGER'
'makes' is the link.
Can you help me to learn more?
(Other definitions for manager that I've seen before include "executive position" , "Coach" , "who sits on the bench?" , "Boss" , "One in charge of sports team" .)