St Paul's correspondent periodically rejected this truism (5)

I believe the answer is:

titus

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'st paul's correspondent periodically rejected this truism' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for titus that I've seen before include "Groan, say" , ". . . . . Andronicus, Shakespearean tragedy" , "Roman emperor with arch" , "saint" , "identifying Philemon's neighbour" .)

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