Taking two banned drugs is simply crazy (8)

I believe the answer is:

crackpot

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

'crazy' is the definition.
(I've seen this before)

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

(Other definitions for crackpot that I've seen before include "Damage utensil for informally eccentric person" , "Nutty" , "Informal eccentric like damaged utensil" , "Fruitcake, screwball" , "Ridiculous" .)

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

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