Crossword Genius

With 40-Across, open for business? (4,3)

Ross

I believe the answer is:

dear sir

(Other definitions for dear sir that I've seen before include "Conventional letter opening to man" , "Conventional opening words of letter to male" , "Conventional opening address to male recipient of letter" , "Traditional intro" , "Opening words of formal letter" .)

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