A religious palindrome (3)

I believe the answer is:

nun

I believe this clue is a double definition.

'a religious' is the first definition.
(nun is a kind of religious)

'palindrome' is the second definition.

(Other definitions for nun that I've seen before include "Convent dweller" , "Woman in religious order" , "Priory female" , "One in holy order" , "Mother Superior, perhaps" .)

I've seen this clue in The Globe and Mail.

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