Crossword Genius

Tango is an energy drink (6)

Ross

I believe the answer is:

tisane

'drink' is the definition.
(tisane is a kind of drink)

'tango is an energy' is the wordplay.
'tango' becomes 'T' (phonetic alphabet: alpha, bravo, charlie etc.).
'energy' becomes 'e' (physics symbol as in E=mc2).
't'+'is'+'an'+'e'='TISANE'

(Other definitions for tisane that I've seen before include "Herbal infusion" , "Herb tea" , "Infusion of e.g. dried or fresh flowers or leaves" , "Herbal tea drink" , "Herb-tea" .)

I've seen this clue in The Telegraph.
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