123 ___ Street (Big Bird's address) (6)

I believe the answer is:

sesame

(Other definitions for sesame that I've seen before include "Open ...... is magic phrase for obtaining access" , "Plant grown for its seeds" , "Open .... is a pantomime cry" , "Oil-rich seed plant" , "Plant cultivated for its seeds - opening word?" .)

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

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