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Trainee dismissing the first profitable venture (6)

Ross

I believe the answer is:

earner

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'trainee' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand the rest of the clue.

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(Other definitions for earner that I've seen before include "A worker for money" , "One receiving income (for work)" , "lucrative job" , "Worker with income" , "Something that makes a profit" .)

I've seen this clue in The Times.
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