Nominally, he led Nora astray (7)

I believe the answer is:

leonard

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'nominally he' is the definition.
The definition suggests a singular noun which matches the answer.

'led nora astray' is the wordplay.
'astray' is an anagram indicator.
'led'+'nora'='lednora'
'lednora' with letters rearranged gives 'LEONARD'.

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(Other definitions for leonard that I've seen before include "-- Cohen, singer" , "-- Bernstein, US conductor" , "man" , "Fellow" , "Elmore ___ , US thriller writer, d. 2013" .)

I've seen this clue in the Evening Standard.

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