Some fellow in sales is successful (4)

I believe the answer is:

wins

I'm a little stuck... Click here to teach me more about this clue!

'is successful' is the definition.
I can't tell whether this defines the answer.

'some fellow in sales' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'WINS' is hidden within 'fellow in sales'.

Can you help me to learn more?

(Other definitions for wins that I've seen before include "Victories" , "Triumphs" , "Finishes in first place" .)

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