The most common and most likely answer to this crossword clue is the 12 letter word RESTAURATEUR
I've seen this crossword clue in The Daily Telegraph
R
E
S
T
A
U
R
A
T
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U
R
Buddy explains!

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 RESTAURATEUR mean?
RESTAURATEUR noun- The owner of a restaurant.