She could be a nit (4)

I believe the answer is:

tina

'she' is the definition.

'could be a nit' is the wordplay.
'could be' indicates an anagram.
'a'+'nit'='anit'
'anit' is an anagram of 'TINA'.

(Another definition for tina that I've seen is " Ain't this a girl?".)

I've seen this clue in the Evening Standard.

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