Crossword Genius

Feminine lingerie - for the junior miss (4,2,1,4)

Ross

I believe the answer is:

slip of a girl

I'm a little stuck... Click here to teach me more about this clue!

'feminine lingerie for the junior' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'miss' is the wordplay.
I cannot quite understand how this works, but
'miss' could be 'girl' (synonyms) and 'girl' is present in the answer.
This explanation may well be incorrect...

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