Cryptic crossword clue
Alien persons – x, y and z 8

The most common and most likely answer to this crossword clue is the 8 letter word UNKNOWNS

U
N
K
N
O
W
N
S

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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 UNKNOWNS mean?

UNKNOWNS noun
  1. A variable (usually x, y or z) whose value is to be found.
  2. Any thing, place, or situation about which nothing is known; an unknown fact or piece of information.
  3. A person of no identity; a nonentity

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