Cryptic crossword clue
Naval officers raised alarm at sea after first sign of rocks 4,8

The most common and most likely answer to this crossword clue is the 4 plus 8 letter word REAR ADMIRALS

I've seen this crossword clue in The Daily Telegraph
R
E
A
R
A
D
M
I
R
A
L
S

Buddy explains!

The straight part
We know that "Naval officers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case naval officers = rear admirals.
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.

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