15 down
Ten
years
at
the
start
of
century?
It’s
enough
mess
(9)
Ten years at the start of century? It’s enough mess (9)
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The definition is at the beginning of the clue.
How the clue works
Look at Ten years at the start of century? — that's your definition, pointing to the decade that kicks off a century. Then "mess" is your anagram indicator, and if you jumble the letters of It's enough you'll find they rearrange neatly into your answer.