The most common and most likely answer to this crossword clue is the 6 letter word KITTEN
I've seen this crossword clue in The Daily Telegraph
K
I
T
T
E
N
More clues leading to the result KITTEN
- Outfit — number for a future queen
- Queen's issue clear, one requiring king's backing
- Young pet: one’s anxious to have many
- Origin of mews? It’s in Kent, strangely
- Origin of mews? It’s in Kent, curiously
- Equipment to catch returning animal
- Young animal in number behind equipment
- Young animal in trap set up under equipment
- Young Christopher has to catch up young Tom
- Youngster with knowledge about one set of races
Buddy explains!

The straight part
We know that "young Tom" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case young tom = kitten.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 KITTEN mean?
KITTEN noun- A young cat, especially before sexual maturity (reached at about seven months).
- A young rabbit, rat, hedgehog, squirrel, fox, beaver, badger, etc.
- A moth of the genus Furcula.
- A term of endearment, especially for a woman.
- To give birth to kittens.