Flapper feels bad about losing jacket (5)
I believe the answer is:
egret
'flapper' is the definition.
(egret is a kind of birdanimal)
'feels bad about losing jacket' is the wordplay.
I cannot really understand how this works, but
'about' could be 're' ('re' means regarding or about) and 're' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for egret that I've seen before include "Lesser white heron" , "White-plumed wader" , "flier" , "White wading-bird" , "Mainly white heron" .)