Crossword Genius

366 days (4,4)

Ross

I believe the answer is:

leap year

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">366 days</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(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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