Messy and disordered lives he'd led (11)

I believe the answer is:

dishevelled

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'messy' is the definition.
Both the definition and answer are adjectives. Perhaps there's an association between them I don't understand?

'disordered lives he'd led' is the wordplay.
'disordered' indicates an anagram.
'lives'+'hed'='liveshed'
'liveshed' is an anagram of 'dishevel'.
'dishevel'+'led'='DISHEVELLED'

'and' is the link.

Can you help me to learn more?

(Other definitions for dishevelled that I've seen before include "Untidy (in appearance)" , "ill-groomed" , "Blowzy" , "In mess" , "Slovenly" .)

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

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