Crossword Genius

Is a wrong number, silly! (7)

Ross

I believe the answer is:

asinine

'silly' is the definition.
(I've seen this before)

'is a wrong number' is the wordplay.
'wrong' indicates anagramming the letters.
'number' becomes 'nine' (nine is a number).
'is'+'a'='isa'
'isa' is an anagram of 'asi'.
'asi'+'nine'='ASININE'

(Other definitions for asinine that I've seen before include "Is Annie? (Anag)" , "Senseless" , "'Mindless, vacuous (7)'" , "Is inane to be foolish" , "Stubborn" .)

I've seen this clue in the Evening Standard.
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