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.
But, I'm not sure how this 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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