The most common and most likely answer to this crossword clue is the 4 letter word TEEN
I've seen this crossword clue in The Times
T
E
E
N
More clues leading to the result TEEN
- Youngster needing support on course, beginning in November
- Youth centres in Leicestershire and Kent
- Youth leader in essence probing into possible age of child?
- Young person supports dropping second name
- Adolescent involved in chaste encounter
- Youth getting through cigarette ends
- Young Treherne appearing regularly
- Youngster clear about English uprising
- Adolescent right to leave wooden utensils
- Peg’s new adolescent
Buddy explains!

The straight part
We know that "Youth" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case youth = teen.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 TEEN mean?
TEEN noun- A teenager.
- Of or having to do with teenagers; teenage
- Grief; sorrow; trouble.
- Vexation; anger; hate.
- To excite; to provoke; to vex; to afflict; to injure.
- To become angry or distressed.
- (provincial) To hedge or fence in; to enclose.