Turns on the radio leading to theatre jobs (5)
I believe the answer is:
roles
'theatre jobs' is the definition.
(roles in a theatrical production)
'turns on the radio' is the wordplay.
'turns' becomes 'rolls' (roll is a kind of turn).
'on the radio' shows a homophone (sound like).
'rolls' is a homophone of 'ROLES'.
'leading to' acts as a link.
(Other definitions for roles that I've seen before include "Parts in plays" , "Theatrical parts" , "Parts in a play" , "Dramatic parts" , "Actors' parts" .)