Crossword Genius

Ancient Aussie car won't start! (5)

Ross

I believe the answer is:

olden

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'ancient' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for olden that I've seen before include "Led on (anag)" , "Former, past" , "(Of days) in the long distant past!" , "Out of date" , "Of past (times)" .)

I've seen this clue in the Sydney Morning Herald.
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