A factor in show business (5)
I believe the answer is:
agent
This could be a double definition.
'a factor' is the first definition.
(I've seen this before)
'show business' is the second definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for agent that I've seen before include "Performer's manager" , "One acting on behalf of another" , "Salesman" , "Person acting on behalf of another" , "Double-zero-seven, for example" .)