Cryptic crossword clue
As naval fighter, put on a shade of blue 10

The most common and most likely answer to this crossword clue is the 10 letter word AQUAMARINE

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "shade of blue" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shade of blue = aquamarine.
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 AQUAMARINE mean?

AQUAMARINE noun
  1. The bluish-green colour of the sea.
  2. A bluish-green variety of beryl.
AQUAMARINE adjective
  1. Of a bluish-green colour.

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