Getting hold of top mathematician (9)
I believe the answer is:
capturing
'getting hold of' is the definition.
(capturing is a kind of getting hold of)
'top mathematician' is the wordplay.
'top' becomes 'cap' (cap is a kind of top**).
'mathematician' becomes 'turing' (Alan Turing).
'cap'+'turing'='CAPTURING'
I've seen this clue in The Telegraph.
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