Islander lived another way - as a marsupial (9,5)
I believe the answer is:
tasmanian devil
'a marsupial' is the definition.
(I know that Tasmanian devil is a type of dasyurid)
'islander lived another way' is the wordplay.
'islander' becomes 'Tasmanian' (someone from Tasmania).
'another way' indicates anagramming the letters.
'lived' with letters rearranged gives 'devil'.
'tasmanian'+'devil'='TASMANIAN DEVIL'
'as' acts as a link.
(Other definitions for tasmanian devil that I've seen before include "Creature" , "This beast is certainly wild" , "Vicious little Aussie" , "Ferocious animal" , "Ferocious Australian marsupial" .)