Cartel controlled wine (6)

I believe the answer is:

claret

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

'cartel controlled' is the wordplay.
'cartel' can be anagrammed to 'CLARET'.
But, I'm unsure how this is indicated.

Can you help me to learn more?

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

I've seen this clue in The Mirror.

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