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
A
T
T
A
I
N
D
E
R
More clues leading to the result ATTAINDER
- Removal of rights of army trapped in a wood
- Achieve reversal of revolutionary loss of rights
- Achieve reversing revolutionary loss of rights
- Tainted rogue imprisoned by a king being deprived of rights
- Accomplish with the German’s historic loss of civil rights
- Get the German punishment for treason
- Complete lifting of revolutionary’s loss of rights
- Confusing ‘anti-trade’ Bill that could get treasonable Lords expelled
- Dear tat in crackers for what was unfair charge
Buddy explains!

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