Arterial route in Australia or Tasmania (5)

I believe the answer is:

aorta

'arterial route' is the definition.
(the aorta is an artery)

'in australia or tasmania' is the wordplay.
'in' says the answer is hidden in the clue.
'AORTA' is hidden within 'australia or tasmania'.

(Other definitions for aorta that I've seen before include "Large artery of the heart" , "Major artery at left of heart" , "Vital blood vessel" , "Great artery in body" , "Tube" .)

I've seen this clue in The Times and The Telegraph.

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