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Extremists on Twitter, wound up, went viral (7)

Ross

I believe the answer is:

trended

'went viral' is the definition.
(as in trending on social networks)

'extremists on twitter wound up' is the wordplay.
'extremists on' says to hollow out the word (remove centre letters) (the letters at the extremes of the word).
'wound up' becomes 'ended' (how things 'wind up' is how they end).
'twitter' with its centre taken out is 'tr'.
'tr'+'ended'='TRENDED'

(Another definition for trended that I've seen is " Turned".)

I've seen this clue in The Telegraph.
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