The most common and most likely answer to this crossword clue is the 8 letter word CLAIMERS
I've seen this crossword clue in The Daily Telegraph
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Buddy explains!
The straight part
We know that "people demanding rights" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case people demanding rights = claimers.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 CLAIMERS mean?
CLAIMERS noun- A person who makes a claim; a claimant.
- A pretender to a royal title.
- A racehorse offered for sale before a race and delivered to the buyer afterwards.
- A claiming race.