Crossword Genius

Untidier disturbed individual? That's right! (7)

Ross

I believe the answer is:

messier

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'untidier' is the definition.
('messy' can be a synonym of 'untidy')

'disturbed individual? that's right' is the wordplay.
'disturbed individual?' becomes 'mess' (I can't justify this - if you can you should give a lot more credence to this answer).
'that's' becomes 'ie'.
'right' becomes 'R' (common abbreviation).
'mess'+'ie'+'r'='MESSIER'

Can you help me to learn more?

(Other definitions for messier that I've seen before include "comparatively untidy" , "Less organised" .)

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