'Dessert', Canadian native's announced (6)
I believe the answer is:
mousse
'dessert' is the definition.
(mousse is a kind of dessert)
'canadian native's announced' is the wordplay.
'canadian native' becomes 'moose' (native species).
'announced' indicates a 'sounds like' (homophone) clue.
'moose' is a homophone of 'MOUSSE'.
(Other definitions for mousse that I've seen before include "Whipped creamy dessert" , "For us, some kind of dessert" , "Creamy dessert; hair dressing" , "Foamy hair preparation" , "Light savoury dish" .)