Some Chablis, seventh heaven (5)
I believe the answer is:
bliss
'heaven' is the definition.
(I've seen this before)
'some chablis seventh' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'BLISS' is hidden in the letters of 'chablis seventh'.
(Other definitions for bliss that I've seen before include "Serene joy" , "Felicity" , "British composer, Arthur (1881-1975) - perfect happiness" , "Perfect joy" , "One who wrote music" .)