Crossword Genius

Caveat ..., let the buyer beware (6)

Ross

I believe the answer is:

emptor

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'caveat' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for emptor that I've seen before include "See 15" , "... emptor, let the buyer beware" , "'Caveat..., let the buyer beware (6)'" , "A Latin buyer - let him caveat" .)

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