Portuguese island (7)
I believe the answer is:
madeira
'portuguese island' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for madeira that I've seen before include "Fortified wine from Atlantic island" , "Portuguese island off northwest Africa" , "Fortified white wine from island off NW Africa" , "Sponge-cake" , "cake producer" .)