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The ultimate source of, say, port's rumour? (9)

Ross

I believe the answer is:

grapevine

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

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(Other definitions for grapevine that I've seen before include "(Informal) means of spreading information?" , "Fruit-bearing plant - rumour mill" , "Informal source of information" , "Bush telegraph" , "fruit producer" .)

I've seen this clue in The Telegraph.
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