This Protestant, sir, could be seen as unrighteous (8)

I believe the answer is:

huguenot

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'this protestant' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for huguenot that I've seen before include "Persecuted French protestant" , "This French protester" , "French Protestant who may have emigrated to Ireland in 17th century" , "C16-17 French Protestant" , "Historically, a French protestant" .)

I've seen this clue in The Telegraph.

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