The last bit of vintage claret is drunk - it tastes sweet (7)
I believe the answer is:
treacle
'it tastes sweet' is the definition.
The definition suggests a singular noun which matches the answer. I also know that 'sweet' relates to this answer.
'the last bit of vintage claret is drunk' is the wordplay.
'the last bit of' indicates one should take the final letters.
'is drunk' indicates anagramming the letters.
The last letter of 'vintage' is 'e'.
'e'+'claret'='eclaret'
'eclaret' with letters rearranged gives 'TREACLE'.
Can you help me to learn more?
(Other definitions for treacle that I've seen before include "Something cloyingly sweet" , "refined product" , "cloying stuff" , "Sweet, black viscous substance" , "Contrived sentimentality - sticky substance" .)