Cryptic crossword clue
One promising firm to sit by sea in Calais 5

The most common and most likely answer to this crossword clue is the 5 letter word COMER

C
O
M
E
R

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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 COMER mean?

COMER noun
  1. One in a race who is catching up to others and shows promise of winning.
  2. One who is catching up in some contest and has a likelihood of victory.
  3. One who arrives.

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