Crossword Genius

Spread gossip framing old lag (11)

Ross

I believe the answer is:

proliferate

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

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for proliferate that I've seen before include "Reproduce a lot" , "Reproduce rapidly" , "Mushroom" , "snowball" , "Multiply, expand" .)

I've seen this clue in The Telegraph.
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