Cryptic crossword clue
With cape and island out of sight detective is at sea in small boat 7

The most common and most likely answer to this crossword clue is the 7 letter word VEDETTE

I've seen this crossword clue in The Daily Telegraph
V
E
D
E
T
T
E

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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 VEDETTE mean?

VEDETTE noun
  1. A sentinel, usually on horseback, stationed on the outpost of an army, to watch an enemy and give notice of danger.

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