The most common and most likely answer to this crossword clue is the 5 plus 6 letter word TEENY BOPPER
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Buddy explains!
The straight part
We know that "Young girl" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case young girl = teeny bopper.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does TEENY BOPPER mean?
TEENY BOPPER noun- A child, especially a girl in her early teens, who follows popular clothing fashions, music trends, etc.