Winged wader, once worshipped (4)

I believe the answer is:

ibis

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'winged wader' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for ibis that I've seen before include "Bird with long neck and legs and a curved bill" , "Winger" , "Large wader" , "Bird sacred in Ancient Egypt" , "Retreat" .)

I've seen this clue in the Evening Standard.

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