Knight of the Round Table in Arthurian legend; younger son of King Bors (6)

I believe the answer is:

lionel

(Other definitions for lionel that I've seen before include "- Bart, (Oliver!)" , "-- Bart; -- Richie" , "Blair possibly" , "Boy" , "Oil Len badly for another man" .)

I've seen this clue in The Mirror.

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