Crossword Genius

Illogical response (3,8)

Ross

I believe the answer is:

non sequitur

(Other definitions for non sequitur that I've seen before include "Something not following on logically" , "Illogical conclusion" , "Statement not expected" , "Reply that has no relevance to what was said before" , "one doesn't follow on" .)

I've seen this clue in The Times and The Sunday Times.
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