The most common and most likely answer to this crossword clue is the 15 letter word COMMISSIONAIRES
I've seen this crossword clue in Independent
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More clues leading to the result COMMISSIONAIRES
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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 COMMISSIONAIRES mean?
COMMISSIONAIRES noun- One entrusted with a (small) commission, such as an errand; especially, an attendant or subordinate employee in a public office, hotel, etc.
- A uniformed doorman.
- An undisclosed agent under European civil law.