But it is usually adults who benefit from this nepotism (4,3,3,4)
I believe the answer is:
jobs for the boys
If this is the answer I cannot explain how the clue works.
Can you help me to learn more?
(Other definitions for jobs for the boys that I've seen before include "Don't employ girls" , "Employment of cronies" , "a result of nepotism" , "favouritism" .)