Crossword Genius

Halfwit is terribly smug on air (9)

Ross

I believe the answer is:

ignoramus

'halfwit' is the definition.

'terribly smug on air' is the wordplay.
'terribly' indicates anagramming the letters.
'smug'+'on'+'air'='smugonair'
'smugonair' with letters rearranged gives 'IGNORAMUS'.

'is' is the link.

(Other definitions for ignoramus that I've seen before include "I wouldn't know" , "Stupid person" , "At the present time" , "A know-nothing" , "one in a state of bliss?" .)

I've seen this clue in The Telegraph.
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