The most common and most likely answer to this crossword clue is the 5 plus 5 letter word ANKLE BITER
I've seen this crossword clue in Independent
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Buddy explains!

The straight part
We know that "Youngster" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case youngster = ankle biter.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.
Crossword Answer definitions
ANKLE BITER noun- A small child.
- A small dog.
- A relatively minor, irritating problem or task.