Crossword Genius

Set a limit on said strong baccy (7)

Ross

I believe the answer is:

caporal

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'set' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

I can't explain the rest of the clue.

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(Another definition for caporal that I've seen is " Coarse, dark tobacco".)

I've seen this clue in The Sunday Times and The Times.
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