Crossword Genius

Write about air on a planet (7)


I believe the answer is:


'planet' is the definition.
(Neptune is an example)

'write about air' is the wordplay.
'write' becomes 'pen' (synonyms).
'about' is a reversal indicator.
'air' becomes 'tune' (synonyms).
'pen' reversed gives 'nep'.

'on a' is the link.

(Other definitions for neptune that I've seen before include "Eighth rock from the Sun" , "Holst movement?" , "World" , "musical work" , "Poseidon" .)

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