Bird is bored by AC/DC (4)

I believe the answer is:

ibis

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'bird' is the definition.
(ibis is a kind of bird)

I cannot understand how the rest of the clue works.

(Other definitions for ibis that I've seen before include "Sacred Egyptian bird" , "Long-legged wading bird" , "Bird, sacred to ancient Egyptians" , "Wading bird with a down-curved bill" , "may be sacred?" .)

I've seen this clue in The Times and The Sunday Times.

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