___ de Triomphe (60-Across monument) (3)

I believe the answer is:

(Other definitions for arc that I've seen before include "Luminous electrical discharge" , "circle? Not entirely" , "Car (anag.)" , "Something used to weld" , "Bend" .)

I've seen this clue in the LA Times, The Star Tribune, The New York Times and the USA Today.

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