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He's about as worthy as a bishop, sir (6)

Ross

I believe the answer is:

knight

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'sir' is the definition.
(knights have the title 'sir')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for knight that I've seen before include "Give title to; chess piece" , "Chevalier" , "Man on board" , "Chesspiece (in shining armour?)" , "Gawain?" .)

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