The most common and most likely answer to this crossword clue is the 6 letter word BEGONE
I've seen this crossword clue in Financial Times
B
E
G
O
N
E
More clues leading to the result BEGONE
- Order to leave: do so imploringly
- Number on petition get out!
- Ask a person for leave
- Get out of it, perhaps with individual on Bass
- Tell somebody to get lost!
- Fervently ask individual to get lost
- Get away and pray sixty minutes after midnight?
- Go away and ask somebody
- Crave unlimited wealth? Get away!
- Go away and ask for money when it’s time for lunch?
Buddy explains!

The straight part
We know that "get out" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case get out = begone.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 BEGONE mean?
BEGONE interjection- Expressing a desire or a command for someone or something to go away.
- To go about; encompass; surround; beset, surround with hostile intent; to overrun.
- To clothe, dress.
- To affect, usually as a good or bad influence, or as a circumstance.
- (humoristic or faux-archaic) To go away, to disappear.