Spooner’s daring promise to local cackler (10)

I believe the answer is:

wattlebird

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'cackler' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

I don't understand the rest of the clue.

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(Another definition for wattlebird that I've seen is " flighty type from down under".)

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

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