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Duration
of
biography’s
going
to
pot
(8)
Duration of biography’s going to pot (8)
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The definition is at the beginning of the clue.
How the clue works
The definition is Duration — how long something lasts. For the wordplay, it's a charade: biography's gives you LIFE'S, and going to pot points to PAN, with "going to" just stitching the two halves together.