Conforming to Jewish dietary law (6)
I believe the answer is:
kosher
'conforming to jewish dietary law' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for kosher that I've seen before include "Conforming to Jewish dietary law" , "Legitimate (Jewish food)" , "Pure (Jewish)" , "Genuine and legitimate (informal)" , "(Of food) meeting Jewish dietary law" .)