Cryptic crossword clue
Nautical warning for new mists over rising mercury 7

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

I've seen this crossword clue in The Guardian
F
O
G
H
O
R
N

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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 FOGHORN mean?

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

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