Cryptic crossword clue
Nautical goo could be forming a clot 11

The most common and most likely answer to this crossword clue is the 11 letter word COAGULATION

C
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Buddy explains!

The straight part
We know that "clot" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case clot = coagulation.
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.

Crossword Answer definitions

COAGULATION noun
  1. The precipitation of suspended particles as they increase in size (by any of several physical or chemical processes)
  2. The process by which blood forms solid clots.
  3. Similar solidification of other materials (e.g. of tofu).

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