Crossword Genius

Once a year (6)

Ross

I believe the answer is:

annual

'once a year' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for annual that I've seen before include "Occurring yearly" , "(Of plant) living for a year or less" , "Once a year, perhaps a book" , "Regular publication" , "plant > book" .)

I've seen this clue in the USA Today.
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