9 down
She
made
crime
novels
airtight
as
each
evolved
(6,8)
She made crime novels airtight as each evolved (6,8)
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The definition is at the beginning of the clue.
How the clue works
Right, so She made crime novels is your definition there - pointing to the queen of mystery herself, Agatha Christie. Then "evolved" is your anagram signal, telling you to shuffle up the letters of "airtight as each" to land on AGATHA CHRISTIE.