The most common and most likely answer to this crossword clue is the 9 letter word POURBOIRE
I've seen this crossword clue in The Times
P
O
U
R
B
O
I
R
E
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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 POURBOIRE mean?
POURBOIRE noun- A tip (extra money given to e.g. a waiter in appreciation of service), especially in French contexts.
- A bribe.