Our man of letters? (4)

I believe the answer is:

paul

'man of letters?' is the definition.
'Paul' can be an answer for 'man'. I am unsure of the 'of letters?' bit.

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

(Other definitions for paul that I've seen before include "- Newman, US actor" , "Boy's name" , "-- Revere, US hero" , "Beatle - singer with Peter and Mary" , "Road-to-Damascus convert" .)

I've seen this clue in The Guardian.

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