Crossword Genius

Chocolate __ (3)

Ross

I believe the answer is:

(Other definitions for lab that I've seen before include "Science room" , "Scientist's workroom" , "Room for scientist" , "Dog" , "Science workshop" .)

I've seen this clue in The New York Times, the Newsday.com, the L.A. Times Daily, the Universal, The Washington Post, The Washington Post Sunday and the LA Times.
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