The most common and most likely answer to this crossword clue is the 7 letter word LEVERET
I've seen this crossword clue in Financial Times
L
E
V
E
R
E
T
More clues leading to the result LEVERET
- Young creature always allowed outside
- Little beast returning from dissolute revels
- Youngster always allowed outside
- Animal allowed to eat at any time
- In French, the worm and young animal
- US prize given to exchange student, ultimately one in first year?
- Seesaw maybe starts to entertain the youngster
- Hare is always among the leaders of leftist existential theatre
- Youngster left on high peak — son’s escaped
- Young runner always filling in permit
Buddy explains!

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 LEVERET mean?
LEVERET noun- A young hare.