What does the cryptic crossword clue "Airy doctrines needing revision? That's optional (13)" mean?

The definition is "optional". The wordplay uses an anagram. anagram of AIRY + DOCTRINES = DISCRETIONARY; definition: "optional" The answer is DISCRETIONARY.

Airy doctrines needing revision? That's optional (13)

Daily Mail Cryptic #17288 | 19 Across | 2024-02-07 flower

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