8 down
Large
bottom:
cut
showing
cheek
(6)
Large bottom: cut showing cheek (6)
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The definition is at the beginning of the clue.
How the clue works
The definition is Large — bumper meaning abundant or oversized. You get there by taking BUM (bottom) and adding PER, which is PERT (cheek, as in impudent) with its last letter cut off.