Australia's koalas have good health! (5)

I believe the answer is:

skoal

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'australia's koalas have good health' is the definition.
I can't judge whether this definition defines the answer.

'australia's koalas have' is the wordplay.
'have' says the answer is hidden in the clue.
'SKOAL' can be found hidden inside 'australias koalas'.

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