Clue that coffee's on (5)

I believe the answer is:

aroma

'clue that coffee's on' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for aroma that I've seen before include "Pleasant odour" , "Distinctive odour" , "Subtle quality" , "Savour" , "Scent - smell" .)

I've seen this clue in the Newsday.com and the Newsday.

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