Understanding, blame the wine (7)
I believe the answer is:
rapport
'understanding' is the definition.
(thesaurus)
'blame the wine' is the wordplay.
'blame' becomes 'rap' ('rap' can be a synonym of 'blame').
'the wine' becomes 'port' (port is a kind of wine).
'rap'+'port'='RAPPORT'
(Other definitions for rapport that I've seen before include "Instinctive understanding between people" , "Mutual sensitivity and understanding" , "Mutual harmony and affinity" , "communion" , "Harmonious relationship between two people" .)