A bird regrets losing its wings (5)

I believe the answer is:

egret

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

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

'regrets losing its wings' is the wordplay.
'EGRET' is hidden within the letters.
However, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for egret that I've seen before include "Lesser white heron" , "Greet (anag) -- wading bird" , "White-plumed wader" , "Long-plumed heron" , "Bird eating fish" .)

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