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As a bird, one gets to fly away from a bishop (4)

Ross

I believe the answer is:

ibis

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

'as' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'a bird one gets to fly away from a bishop' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
'gets' could be 'is' (I've seen this in other clues) and 'is' is present in the answer.
'bishop' could be 'b' (chess abbreviation) and 'b' is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for ibis that I've seen before include "Eastern" , "Bird sacred in Ancient Egypt" , "State of central US, capital Lincoln" , "Large wading birds with down-curved bills" , "Wading bird sacred to the Egyptians" .)

I've seen this clue in the Evening Standard.
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