Bird regrettably chokes (5)
I believe the answer is:
egret
'bird' is the definition.
(egret is a kind of bird)
'regrettably chokes' 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 "Greet (anag) -- wading bird" , "Mainly white heron" , "One of a pair of waders" , "one with plume" , "Lesser white heron" .)