Crossword Genius

366 days (4,4)

Ross

I believe the answer is:

leap year

'366 days' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for leap year that I've seen before include "Period with an intercalary day" , "when summer Olympics are held?" , "Three hundred and sixty six-day period" , "It contains an extra day" , "366, not 365 days" .)

I've seen this clue in The Mirror.
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