Crossword Genius

Mostly grand manner not unknown in letter (7)

Ross

I believe the answer is:

epistle

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

I can't explain the remainder of the clue.

(Other definitions for epistle that I've seen before include "(E.g. Paul's) letter" , "Specially long and formal letter" , "Maybe Paul's" , "A letter - as from Apostle?" , "Writing" .)

I've seen this clue in The Times.
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