Crossword Genius

Mourns departed bird in the mountains (7)

Ross

I believe the answer is:

bemoans

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

'mourns departed' is the definition.
I can't tell whether this defines the answer.

'bird in the mountains' is the wordplay.
'bird' becomes 'moa' (extinct flightless bird of New Zealand).
'in the' indicates putting letters inside.
'mountains' becomes 'bens' (as in Ben Nevis in Scotland).
'moa' inserted within 'bens' is 'BEMOANS'.

Can you help me to learn more?

(Another definition for bemoans that I've seen is " Regrets".)

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