Vigneron tends to keep this source of gossip (9)
I believe the answer is:
grapevine
This could be a double definition.
'vigneron tends to keep this source' is the first definition.
'grapevine' can be an answer for 'source' (I have seen 'source of rumour' mean 'grapevine' so perhaps 'source' could also mean 'grapevine'). I am not certain of the rest of the definition.
'gossip' is the second definition.
(I know that grapevine is a type of gossip)
'of' is the link.
Can you help me to learn more?
(Other definitions for grapevine that I've seen before include "Unofficial oral relaying of information" , "Informal channel of information" , "News source" , "Plant source of wine" , "Supposed medium for spreading news" .)