Unusual danger for a goose (6)
I believe the answer is:
gander
'goose' is the definition.
(male goose)
'unusual danger' is the wordplay.
'unusual' indicates anagramming the letters.
'danger' anagrammed gives 'GANDER'.
'for a' acts as a link.
(Other definitions for gander that I've seen before include "Male goose; look (colloq.)" , "He has webbed feet" , "male member of the Anatidae family" , "Ranged over the bird" , "Bird from Newfoundland airport" .)