Wine cartel set up again (6)

I believe the answer is:

claret

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'wine' is the definition.
(claret is a kind of wine)

'cartel set up again' is the wordplay.
'cartel' anagrams to 'CLARET'.
Though, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for claret that I've seen before include "Deep purplish-red" , "vessel might contain this?" , "Deep purplish colour" , "Type of red wine" , "Irish county starts the wine" .)

I've seen this clue in The Globe and Mail.

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