Eastern flower established in Dunedin dust (5)

I believe the answer is:

indus

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'eastern flower' is the definition.
'Indus' can be an answer for 'flower' (Indian river). I am unsure of the 'eastern' bit.

'established in dunedin dust' is the wordplay.
'established in' indicates a hidden word.
'INDUS' can be found hidden inside 'dunedin dust'.

Can you help me to learn more?

(Other definitions for indus that I've seen before include "Long river of Asia" , "Sacred flower" , "Major river of Pakistan" , "Great river of South Asia" , "9 of Pakistan" .)

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

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