Crossword Genius

Stupid, as I figure (7)

Ross

I believe the answer is:

asinine

'stupid' is the definition.
(thesaurus)

'as i figure' is the wordplay.
'figure' becomes 'nine' (I've seen this in other clues).
'as'+'i'+'nine'='ASININE'

(Other definitions for asinine that I've seen before include "Donkey-like" , "Daft" , "Is inane to be foolish" , "'Mindless, vacuous (7)'" , "Idiotic" .)

I've seen this clue in The Telegraph.
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