Australian youngster, a burden to his mum? (4)

I believe the answer is:

joey

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'australian youngster a burden to his mum?' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

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(Other definitions for joey that I've seen before include "Baby boomer's" , "Young kangaroo" , "Sydney's youngster" , "jumper, in a pocket?" , "Threepenny bit" .)

I've seen this clue in the Evening Standard.

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