Wine talk is endless - almost heaven! (7)
I believe the answer is:
chablis
'wine' is the definition.
(Chablis is an example)
'talk is endless almost heaven' is the wordplay.
'talk' becomes 'chat' (chat can mean to talk).
'is endless' means to remove the last letter.
'almost' means to remove the last letter (most of the word but not all of it).
'heaven' becomes 'bliss' (I've seen this in another clue).
'chat' with its final letter taken away is 'cha'.
'bliss' with its final letter taken away is 'blis'.
'cha'+'blis'='CHABLIS'
(Other definitions for chablis that I've seen before include "Dry Burgundy wine" , "Drink" , "French town noted for white Burgundy wines" , "Burgundy town and white wine" , "Town in north central France noted for white Burgundy wines" .)