Crossword Genius

In business, one can be tarred! (6)

Ross

I believe the answer is:

trader

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

'in business one' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'can be tarred' is the wordplay.
'can be' indicates an anagram.
'tarred' anagrammed gives 'TRADER'.

Can you help me to learn more?

(Other definitions for trader that I've seen before include "One selling" , "Merchant ship; dealer" , "One buys and sells" , "Retard (anag.)" , "He buys and sells goods" .)

I've seen this clue in the Evening Standard.
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