Crossword Genius

Found in a barrel in Ennis at last? (6)

Ross

I believe the answer is:

claret

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'last?' 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 the remainder of the clue.

Can you help me to learn more?

(Other definitions for claret that I've seen before include "drink" , "Deep red colour" , "Deep purplish colour" , "English word for red Bordeaux wine" , "Dark purplish-red colour" .)

I've seen this clue in The Irish Times.
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