The most common and most likely answer to this crossword clue is the 4 letter word COLT
I've seen this crossword clue in The Times
C
O
L
T
More clues leading to the result COLT
- Young player left in bed
- One maybe fired youngster on track?
- Left, in bed, a little horse
- Two officers showing gun
- Pass trainer’s first young player
- One may frisk -- for a gun
- Youngster left in bed
- Horse that’s fired with enthusiasm in a Western?
- Inexperienced person, inexperienced person in bed
- Horse pistol?
Buddy explains!

The straight part
We know that "Young player" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case young player = colt.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 COLT mean?
COLT noun- A young male horse.
- A young crane (bird).
- A youthful or inexperienced person; a novice.
- A short piece of rope once used by petty officers as an instrument of punishment.
- A young camel or donkey.
- To horse; to get with young.
- To befool.
- To frisk or frolic like a colt; to act licentiously or wantonly.