I'm taking drug to part of hospital that's without power (8)

I believe the answer is:

impotent

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'without power' is the definition.
I can't tell whether this definition defines the answer.

'i'm taking drug to part of hospital' is the wordplay.
'taking' is a charade indicator (letters next to each other).
'drug' becomes 'pot' (slang term for cannabis).
'to part of hospital' becomes 'ent' (abbreviation for Ear, Nose and Throat department).
'im'+'pot'+'ent'='IMPOTENT'

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for impotent that I've seen before include "Useless" , "Helpless, powerless" , "Powerless like mon petit" , "Ineffective" , "Mon petit may be powerless" .)

I've seen this clue in The Independent.

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