The most common and most likely answer to this crossword clue is the 9 letter word STRANGERS
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Buddy explains!
The straight part
We know that "Visitors" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case visitors = strangers.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 STRANGERS mean?
STRANGERS noun- A person whom one does not know; a person who is neither a friend nor an acquaintance.
- An outsider or foreigner.
- One not admitted to communion or fellowship.
- A newcomer.
- One who has not been seen for a long time.
- One not belonging to the family or household; a guest; a visitor.
- One not privy or party to an act, contract, or title; a mere intruder or intermeddler; one who interferes without right.
- A superstitious premonition of the coming of a visitor by a bit of stalk in a cup of tea, the guttering of a candle, etc.