The most common and most likely answer to this crossword clue is the 3 letter word CUB
C
U
B
More clues leading to the result CUB
- Large island, not a little one
- Copper, British – he’s young
- Youngster in society lacking length
- Young reporter's association - that's not large
- Country, short in youth
- Young animal somewhat short of power
- CUB
- Almost die as young animal
- An honour to welcome superior’s young son?
- Youngster of eight, say, lacking energy
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 = cub.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 CUB mean?
CUB noun- A young fox.
- (by extension) The young of certain other animals, including the bear, wolf, lion and tiger.
- A child, especially an awkward, rude, ill-mannered boy.
- A young man who seeks relationships with older women, or "cougars".
- A stall for cattle.
- A cupboard.
- To give birth to cubs
- To hunt fox cubs
- To shut up or confine.
- A young, inexperienced reporter employed by a newspaper or magazine.
- A person who is unsophisticated or of a lower class background but achieving a high salary, who spends money on flashy or trashy items to fulfil their aspirations of higher social status. The stereotype includes having speech and mannerisms that are considered to denote poor education and uncultured upbringing, which is reflected in their bad taste possessions and lifestyles.