Cryptic crossword clue
Sunk in ready under the sea 4-3

The most common and most likely answer to this crossword clue is the 4 plus 3 letter word DEEP SET

I've seen this crossword clue in The Times
D
E
E
P
S
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T

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The straight part
We know that "Sunk" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sunk = deep set.
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 DEEP SET mean?

DEEP SET adjective
  1. Set deeply below a surface, as on a face.

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