Crossword Genius

A factor in show business (5)


I believe the answer is:


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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" .)

I've seen this clue in The Globe and Mail.
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