Cryptic crossword clue
Writer involved in a recent riot shows remorse 10

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

I've seen this crossword clue in The Guardian
R
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Buddy explains!

The straight part
We know that "remorse" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case remorse = repentance.
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 REPENTANCE mean?

REPENTANCE noun
  1. The condition of being penitent.
  2. A feeling of regret or remorse for doing wrong or sinning.

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