Crossword Genius

"Happy Days ___ Here Again" (3)

Ross

I believe the answer is:

(Other definitions for are that I've seen before include "(We/they/you) exist" , "live" , "Unit of land measure equal to 100 square metres" , "Exist; square measure" , "Is, in the plural" .)

I've seen this clue in The Mirror and The New York Times.
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