Marsupial, one breaking ring on bird (9)
I believe the answer is:
bandicoot
'marsupial' is the definition.
(bandicoot is a kind of marsupial)
'one breaking ring on bird' is the wordplay.
I cannot really see how this works, but
'one' could be 'an' (I've seen this in other clues) and 'an' is present in the answer.
'ring' could be 'o' and 'o' is located in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bandicoot that I've seen before include "Little animal" , "native of Australia" , "Australian marsupial with long pointed muzzle and tail" , "rat is seen" , "Insect-eating marsupial of Australia and New Guinea" .)