Bird, bird, southern birds (10)

I believe the answer is:

eaglehawks

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'birds' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'bird bird southern' is the wordplay.
'bird' becomes 'eagle' (eagle is a type of bird).
'bird' becomes 'hawk' (hawk is a kind of bird).
'southern' becomes 's' (abbreviation).
'eagle'+'hawk'+'s'='EAGLEHAWKS'

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

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