Said ‘marsupials’ with regrets (4)
I believe the answer is:
rues
'regrets' is the definition.
('rue' can be a synonym of 'regret')
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for rues that I've seen before include "Is sorry for - plants" , "Regrets, to be sure" , "Bemoans" .)