What does the cryptic crossword clue "Whiskey, port and bitter called for (3)" mean?

The definition is "Whiskey". The wordplay uses a homophone (sounds like). Homophone [ called for ] of WRY ("bitter") The answer is RYE.

Whiskey, port and bitter called for (3)

Guardian Cryptic #28992 | 27 Down | 2023-02-13 flower