The most common and most likely answer to this crossword clue is the 10 letter word GRAPEVINES
I've seen this crossword clue in The Sunday Telegraph
G
R
A
P
E
V
I
N
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S
More clues leading to the result GRAPEVINES
Buddy explains!
The straight part
We know that "These sources of rumours" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case these sources of rumours = grapevines.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does GRAPEVINES mean?
GRAPEVINES noun- The plant, a vine of genus Vitis, on which grapes grow.
- A rumor.
- An informal person-to-person means of circulating information or gossip.
- A move in which the feet are alternately placed in front of each other, while both remaining on the ice or ground, incorporating half-turns.
- A leglock.