Crossword Genius

Silence a crazy (4)

Ross

I believe the answer is:

gaga

'crazy' is the definition.
(thesaurus)

'silence a' is the wordplay.
'silence' becomes 'gag' (gagging is a kind of silencing).
'gag'+'a'='GAGA'

(Other definitions for gaga that I've seen before include "bananas" , "Slangily crazy, off one's head" , "fatuous?" , "Barmy joke, third in cracker" , "Slightly mad (colloq.)" .)

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