Take a shot of a drug? (3)

I believe the answer is:

pot

I'm a little stuck... Click here to teach me more about this clue!

'a drug?' is the definition.
(slang term for cannabis)

I don't understand how the remainder of the clue works.

(Other definitions for pot that I've seen before include "Saucepan" , "Grass" , "Cooking utensil or illegal drug" , "Somewhere to go" , "Cylindrical container" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app