Crossword Genius

Jail Una, unruly girl (7)

Ross

I believe the answer is:

juliana

'girl' is the definition.

'jail una unruly' is the wordplay.
'unruly' indicates anagramming the letters.
'jail'+'una'='jailuna'
'jailuna' anagrammed gives 'JULIANA'.

I've seen this clue in The Times.
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