Knock wine connection (7)

I believe the answer is:

rapport

'connection' is the definition.
(I've seen this before)

'knock wine' is the wordplay.
'knock' becomes 'rap' (synonyms).
'wine' becomes 'port' (port wine is a kind of wine).
'rap'+'port'='RAPPORT'

(Other definitions for rapport that I've seen before include "Pro rapt with fellow feeling" , "Bond of sympathy" , "Sympathetic relationship" , "Emotional bond" , "communion" .)

I've seen this clue in The Sun.

Want a hint initially instead of a full solution? Install my app