Crossword Genius

I rouse fools with cunning, no joking (9)

Ross

I believe the answer is:

seriously

'no joking' is the definition.
(without joking or silliness)

'i rouse fools with cunning' is the wordplay.
'fools' indicates an anagram (I've seen this in other clues).
'with' is a charade indicator (letters next to each other).
'cunning' becomes 'sly' (synonyms).
'i'+'rouse'='irouse'
'irouse' with letters rearranged gives 'seriou'.
'seriou'+'sly'='SERIOUSLY'

(Other definitions for seriously that I've seen before include "In a solemn and thoughtful manner" , "Gravely" .)

I've seen this clue in The Guardian.
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