Cryptic crossword clue
Summit mostly cool about old thick fog 3-6

The most common and most likely answer to this crossword clue is the 3 plus 6 letter word PEA SOUPER

I've seen this crossword clue in Financial Times
P
E
A
S
O
U
P
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Buddy explains!

The straight part
We know that "thick fog" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case thick fog = pea souper.
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 PEA SOUPER mean?

PEA SOUPER noun
  1. A dense, yellowish fog, often mixed with smoke; a pea-soup fog, a smog.
  2. A French-Canadian person, especially a Francophone from the province of Québec.

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