Slander stupid ten-across. I pass! (4,10)

I believe the answer is:

cast aspersions

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

'stupid ten-across i pass' is the wordplay.
'stupid' is an anagram indicator (in a stupid order).
'ten'+'across'+'i'+'pass'='tenacrossipass'
'tenacrossipass' anagrammed gives 'CAST ASPERSIONS'.

(Another definition for cast aspersions that I've seen is " slander".)

I've seen this clue in the Sydney Morning Herald.

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