Wine, round cheese, and fresh air (7)
I believe the answer is:
madeira
'wine' is the definition.
(I know that Madeira is a type of fortified wine)
'round cheese and fresh air' is the wordplay.
'round' shows that the letters should be reversed in order.
'cheese' becomes 'edam' (Edam is an example).
'and' means one lot of letters go next to another.
'fresh' indicates an anagram (a fresh re-ordering of the letters).
'edam' written backwards gives 'made'.
'air' with letters rearranged gives 'ira'.
'made'+'ira'='MADEIRA'
(Other definitions for madeira that I've seen before include "Sponge-cake" , "Rich, fortified white wine" , "Portuguese island, capital Funchal" , "Island in the Atlantic Ocean" , "Portuguese North Atlantic island" .)