Crossword Genius

Result of dental anaesthesia overdose? Idiot! (9)

Ross

I believe the answer is:

numbskull

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

I don't understand the rest of the clue.

(Other definitions for numbskull that I've seen before include "Dimwit" , "Idiot" , "of limited intelligence" , "Blockhead, bonehead" , "Fool" .)

I've seen this clue in The Guardian.
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