Take a shot of cannabis (3)

I believe the answer is:

pot

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

'cannabis' is the definition.
(I know that cannabis can be written as pot)

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

(Other definitions for pot that I've seen before include "...Karenina(Tolstoy)" , "Weed" , "prize" , "Somewhere to go" , "Trophy; kitty" .)

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

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