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Weapon hauls shocking, but bishop is fine (10,5)

Ross

I believe the answer is:

winchester rifle

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

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

'hauls shocking but bishop is fine' is the wordplay.
I cannot quite understand how this works, but
'bishop' could be 'rr' (abbreviation for Right Reverend) and 'rr' is present in the answer.
'fine' could be 'f' (abbreviation) and 'f' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for winchester rifle that I've seen before include "weapon" , "gun" , "Arm" .)

I've seen this clue in The Sunday Times.
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