Crossword Genius

Whiskey, port and bitter called for (3)

Ross

I believe the answer is:

rye

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'whiskey' is the definition.
(rye whiskey is a type of whiskey)

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

Can you help me to learn more?

(Other definitions for rye that I've seen before include "One of Cinque Ports" , "Hard liquor" , "Burns's body came through" , "Wheat-like cereal plant" , "East Sussex resort" .)

I've seen this clue in The Guardian.
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