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Common
cold
going
round
pub,
endlessly
(7)
Common cold going round pub, endlessly (7)
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The definition is at the beginning of the clue.
How the clue works
Right, so Common's your definition there, as in widespread or popular. For the wordplay, take POLAR (that's your "cold"), and wrap it round PU — which is PUB with the last letter chopped off, since it's going "endlessly" — giving you PO-PU-LAR.