Cryptic crossword clue
Start to lecture a French rustic without it being rude 10

The most common and most likely answer to this crossword clue is the 10 letter word UNPLEASANT

I've seen this crossword clue in The Times
U
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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.
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What does UNPLEASANT mean?

UNPLEASANT adjective
  1. Not pleasant.

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