Contents of pouch spur a mail resort (9)

I believe the answer is:

marsupial

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'contents of pouch' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'spur a mail resort' is the wordplay.
'resort' is an anagram indicator.
'spur'+'a'+'mail'='spuramail'
'spuramail' is an anagram of 'MARSUPIAL'.

Can you help me to learn more?

(Other definitions for marsupial that I've seen before include "eg Wallaby" , "Mammal that carries its young in a pouch" , "Sort of animal" , "Joey maybe" , "Kangaroo, for example" .)

I've seen this clue in the Sydney Morning Herald.

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