Stimulant in tea or coffee (8)

I believe the answer is:

caffeine

(Other definitions for caffeine that I've seen before include "Drug found in tea" , "Fine face (anag.)" , "Stimulating substance found in fine cafe, oddly" , "Stimulant in tea, etc" , "Stimulant found in tea and coffee" .)

I've seen this clue in The Mirror.

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