Cryptic crossword clue
Tyrannical lunatic is perverse 10

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

I've seen this crossword clue in Financial Times
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.
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What does REPRESSIVE mean?

REPRESSIVE adjective
  1. Serving to repress or suppress; oppressive

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