Crossword Genius

Is a back number and stupid (7)

Ross

I believe the answer is:

asinine

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Here is my best explanation:

'stupid' is the definition.
(thesaurus)

'is a back number' is the wordplay.
'back' says the letters should be written backwards.
'number' becomes 'nine' (nine is a kind of number).
'is'+'a'='isa'
'isa' backwards is 'asi'.
'asi'+'nine'='ASININE'

'and' is the link.

Ross

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This clue was last seen in Evening Standard

(Other definitions for asinine that I've seen before include "Senseless", "Is inane to be foolish", "Daft", "Foolish like donkey", "Stupid (as a donkey?)", "Jenny's often like this", "senseless", "Being stupid", "Really silly, ridiculous" and "Foolish, silly".)

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