Vivid reaction from drunk after endless Merlot? (7)

I believe the answer is:

graphic

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'vivid' is the definition.
(I know that vivid can be written as graphic)

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

Can you help me to learn more?

(Other definitions for graphic that I've seen before include "Giving vivid detail" , "Vividly explicit" , "Expressive" , "Vivid - computer-generated image" , "Visually clearly described" .)

I've seen this clue in The Times.

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