Cryptic crossword clue
King’s concerned with the unknown 3

The most common and most likely answer to this crossword clue is the 3 letter word REX

R
E
X


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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 REX mean?

REX noun
  1. An animal which has a genetic recessive variation that causes the guard hairs to be very short or fully lacking.

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