Rogue a bit insane not attending court? (2,8)
I believe the answer is:
in absentia
'not attending court?' is the definition.
'rogue a bit insane' is the wordplay.
'rogue' indicates an anagram.
'a'+'bit'+'insane'='abitinsane'
'abitinsane' anagrammed gives 'IN ABSENTIA'.
(Other definitions for in absentia that I've seen before include "Wanting an appearance" , "away" , "not at event" , "While not present (Latin)" .)