25 across
Alan
Turing’s
beginning
to
comprehend
Nazis’
smart
tech
he
attacks
(9)
Alan Turing’s beginning to comprehend Nazis’ smart tech he attacks (9)
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The definition is at the end of the clue.
How the clue works
Look at he attacks at the end — that's your definition. Take ALAN and T (the beginning of Turing) to give you ALANT, then have it 'comprehend' (contain) SS (Nazis) and AI (smart tech, artificial intelligence) slotted in after the first A: A, then SS, then AI, then LANT.