Cryptic crossword clue
Killer harboured by Windsor Castle 4

The most common and most likely answer to this crossword clue is the 4 letter word ORCA

I've seen this crossword clue in The Daily Telegraph
O
R
C
A


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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 ORCA mean?

ORCA noun
  1. A sea mammal (Orcinus orca) related to dolphins and porpoises, commonly called the killer whale.

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