Clothes left out for friend from Australia (6)

I believe the answer is:

cobber

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'friend from australia' is the definition.
(Australian term for a friend)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for cobber that I've seen before include "Mate (Australian)" , "A down-under friend or mate" , "Australian term for a pal" , "Antipodean chum" .)

I've seen this clue in The Times.

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