One being advised when workers gain support (6)
I believe the answer is:
mentee
'one being advised' is the definition.
(someone with a mentor)
'workers gain support' is the wordplay.
'workers' becomes 'men' (men can mean staff or employees).
'gain' is a charade indicator (letters next to each other).
'support' becomes 'tee' (tee is a kind of support).
'men'+'tee'='MENTEE'
'when' is the link.
(Other definitions for mentee that I've seen before include "someone getting help to pick up business" , "who gets counselling" .)