Cryptic crossword clue
Tainted rogue imprisoned by a king being deprived of rights 9

The most common and most likely answer to this crossword clue is the 9 letter word ATTAINDER

I've seen this crossword clue in Financial Times
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The straight part
We know that "deprived of rights" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case deprived of rights = attainder.
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 ATTAINDER mean?

ATTAINDER noun
  1. The state a prisoner enters once a death sentence (usually for treason) had been issued; the state of being stripped of all civil rights.
  2. A stain; a state of dishonour or condemnation.

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