Viticulture's rumour mill? (9)
I believe the answer is:
grapevine
This clue could be a double definition.
'viticulture's' is the first definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?
'rumour mill?' is the second definition.
(I've seen this before)
(Other definitions for grapevine that I've seen before include "Bush telegraph" , "origin of wine?" , "(Informal) means of spreading information?" , "whose constituents go to press" , "Supposed medium for spreading news" .)