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Blimey,
pinching
bottom
is
less
civilised
(7)
Blimey, pinching bottom is less civilised (7)
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The definition is at the end of the clue.
How the clue works
Right, so Blimey there is just COR, your exclamation. Now it says it's "pinching bottom", so COR grabs hold of ARSE (that's your "bottom") and swallows it whole, giving you CO-ARSE-R. The definition tucked away is less civilised, which is exactly what coarser means.