Crime against the state (7)
I believe the answer is:
treason
'crime against the state' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for treason that I've seen before include "One's art? (anag)" , "Lese-majesty" , "Disloyalty (to one's country)" , "Crime of disloyalty" , "Gunpowder Plot, say" .)