Crossword Genius

Highly intoxicating (5)

Ross

I believe the answer is:

heady

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'intoxicating' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for heady that I've seen before include "Potent, intoxicating" , "Impetuous" , "Inebriating" , "Extremely exciting" .)

I've seen this clue in The Globe and Mail.
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