Australasian word of regret (4)

I believe the answer is:

alas

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'word of regret' is the definition.
(I've seen this in another clue)

'australasian' is the wordplay.
'ALAS' is hidden within the letters.
However, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for alas that I've seen before include "'- Poor Yorick' (Hamlet)" , "Proper, respectable" , "Expression of regret" , "More's the pity" , "Expression of grief/pity" .)

I've seen this clue in the Evening Standard.

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