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Doctor admits I raised relative from Australia produced by one of those who has passed away, a long time ago? (8)

Ross

I believe the answer is:

dinosaur

I'm a little stuck... Click here to teach me more about this clue!

'doctor admits i raised relative from australia produced by one of those who has passed away a long time ago?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'from australia produced by one of those who has passed away a long time ago?' is the wordplay.
I cannot quite see how this works, but
'from' could be 'in' (I've seen this in other clues) and 'in' is found in the answer.
'australia' could be 'au' and 'au' is found within the answer.
'of' could be 'o' and 'o' is found in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for dinosaur that I've seen before include "Old-fashioned type" , "Large extinct reptile" , "Huge beast" , "Eg, triceratops" , "Large extinct creature" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).
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