Crossword Genius

Aphorism: "completely bonkers" (3,2,1,6)

Ross

I believe the answer is:

mad as a hatter

(Other definitions for mad as a hatter that I've seen before include "Completely insane (informal)" , "Sun-orbiting body" , "Totally daft" , "Completely daft" , "Completely foolish" .)

I've seen this clue in the Sydney Morning Herald.
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