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

Ross

I believe the answer is:

knight

I'm a little stuck... Click here to teach me more about this clue!

'sir' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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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