Feasibility of going back to create environment for bird (4)
I believe the answer is:
ibis
'for bird' is the definition.
(ibis is a kind of bird)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for ibis that I've seen before include "Wading bird of tropical waters" , "Wading bird sacred to the Egyptians" , "may be sacred?" , "Slowly discharge" , "Bird with long neck and legs and a curved bill" .)