Mighty hunter amid the Maori once (5)

I believe the answer is:

orion

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

'mighty hunter' is the definition.
'orion' can be an answer for 'hunter' (constellation). I am unsure of the 'mighty' bit.

'amid the maori once' is the wordplay.
'amid' indicates a hidden word.
'ORION' is hidden within 'maori once'.

Can you help me to learn more?

(Other definitions for orion that I've seen before include "Constellation with seven bright stars" , "Great hunter of Greek myth, and a constellation" , "Constellation in the form of a belt" , "hero" , "Group in heaven" .)

I've seen this clue in the Evening Standard.

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