Island created fresh air (7)
I believe the answer is:
madeira
'island' is the definition.
(Madeira is a Portuguese island)
'created fresh air' is the wordplay.
'created' becomes 'made' ('make' can be a synonym of 'create').
'fresh' indicates an anagram (a fresh re-ordering of the letters).
'air' with letters rearranged gives 'ira'.
'made'+'ira'='MADEIRA'
(Other definitions for madeira that I've seen before include "A fortified wine, a rich sponge" , "Sponge-cake" , "Atlantic territory" , "cake producer" , "Fortified white wine from island off NW Africa" .)