A takeaway merchant (6)

I believe the answer is:

robber

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'a takeaway merchant' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?

This is the entire clue.

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(Other definitions for robber that I've seen before include "Highwayman, for example" , "Mugger" , "Burglar" , "One who steals" , "Violent thief" .)

I've seen this clue in the Evening Standard.

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