Crossword Genius

Stimulant drug (5)

Ross

I believe the answer is:

upper

'stimulant drug' is the definition.
(I know that upper is a type of stimulant drug)

This is the entire clue.

(Other definitions for upper that I've seen before include "Higher in position; drug" , "Higher; part of boot" , "Part of a shoe; drug" , "catcher of swans?" , "that's found in shoe" .)

I've seen this clue in The Guardian.
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