Isn’t well after an animal attacks (7)
I believe the answer is:
assails
'attacks' is the definition.
('assail' can be a synonym of 'attack')
'isn't well after an animal' is the wordplay.
'isn't well' becomes 'ails' (I've seen this in another clue).
'after' says to put letters next to each other.
'an animal' becomes 'ass' (term for a donkey).
'ails' after 'ass' is 'ASSAILS'.
(Other definitions for assails that I've seen before include "Attacks" , "storms" .)