Crossword Genius

On radio, prepare a town for a cackling bird (10)

Ross

I believe the answer is:

kookaburra

'cackling bird' is the definition.

I don't understand how the rest of the clue works.

(Other definitions for kookaburra that I've seen before include "Large kingfisher (aka laughing jackass)" , "Strident Australian" , "He may be laughing!" , "Australian bird" , "Australian kingfisher" .)

I've seen this clue in The Times.
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