Pauline may describe these letters (8)

I believe the answer is:

epistles

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'these letters' is the definition.
(epistle is a kind of letter)

I don't understand how the rest of the clue works.

(Other definitions for epistles that I've seen before include "It sleeps among letters of the Apostles" , "Biblical letters" , "Letters, missives" , "Long communications" .)

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

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