Crossword Genius

Guy picked up fish drink (7)

Ross

I believe the answer is:

cordial

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'drink' is the definition.
(cordial is a kind of drink)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for cordial that I've seen before include "7 [HEARTY]" , "Agreeable - drink" , "Affable type of sweet drink?" , "stimulating drink" , "drink with a fruity flavour" .)

I've seen this clue in The Telegraph.
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