Inane, disorganised girl (5)

I believe the answer is:

annie

'girl' is the definition.

'inane disorganised' is the wordplay.
'disorganised' indicates an anagram.
'inane' is an anagram of 'ANNIE'.

(Other definitions for annie that I've seen before include "Musical about markswoman" , "Popular musical about Little Orphan" , "Famous musical about orphan girl" , "- Get your Gun, musical" , "Oakley, Laurie or Hall" .)

I've seen this clue in The Mirror.

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