In accordance with Jewish law (6)
I believe the answer is:
kosher
'in accordance with jewish law' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for kosher that I've seen before include "Genuine and legitimate (informal)" , "Edible for Jew" , "Correct ? legitimate" , "strict rules" , "Of food, conforming to Jewish dietary laws" .)