Crossword Genius

Buster did become unhinged (9)

Ross

I believe the answer is:

disturbed

'unhinged' is the definition.
(I know that unhinged can be written as disturbed)

'buster did become' is the wordplay.
'become' indicates anagramming the letters.
'buster'+'did'='busterdid'
'busterdid' is an anagram of 'DISTURBED'.

(Other definitions for disturbed that I've seen before include "Changed the set arrangement or made uneasy" , "Emotionally upset -- worried" , "Troubled" , "Intruded on" , "Agitated" .)

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