Avian bringer of happiness (8)

I believe the answer is:

bluebird

(Other definitions for bluebird that I've seen before include "Donald Campbell's speedboat - relative of thrush" , "symbol of happiness" , "Cerulean flier associated with happiness" , "Name of the cars and boats in which Malcolm and Donald Campbell set land and water speed records" , "American member of thrush family (seen over Dover?)" .)

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

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