"The pause that refreshes" sloganeer, once (4)

I believe the answer is:

coke

(Other definitions for coke that I've seen before include "Residue from coal used as fuel" , "something for heating" , "Fuel derived from coal" , "Substance left after gas and tar have been extracted from coal" , "Carbonised fuel residue" .)

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

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