Cryptic crossword clue
Warning signals for NHS go off 8

The most common and most likely answer to this crossword clue is the 8 letter word FOGHORNS

I've seen this crossword clue in Financial Times
F
O
G
H
O
R
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S

Buddy explains!

The straight part
We know that "Warning signals" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case warning signals = foghorns.
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 FOGHORNS mean?

FOGHORNS noun
  1. A very loud low-pitched horn, used especially in lighthouses and on large boats.

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