Autumnal full moon (7,4)

I believe the answer is:

harvest moon

(Other definitions for harvest moon that I've seen before include "Sight around the autumn equinox" , "Lunar appearance closest to autumn equinox" , "One may appear in September" , "Mid-September occurrence in the night sky" , "It's seen close to the autumn equinox" .)

I've seen this clue in The Guardian.

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