Wine one gets in a dream, perhaps (7)
I believe the answer is:
madeira
'wine' is the definition.
(Madeira is an example)
'one gets in a dream perhaps' is the wordplay.
'one' becomes 'I' (Roman numeral).
'gets in' is an insertion indicator.
'perhaps' indicates anagramming the letters.
'a'+'dream'='adream'
'adream' is an anagram of 'madera'.
'i' put within 'madera' is 'MADEIRA'.
(Other definitions for madeira that I've seen before include "Fortified white wine from island off NW Africa" , "Cake - wine" , "A fortified wine, a rich sponge" , "cake producer" , "Islands in the Stream?" .)