Pass, as a law (5)
I believe the answer is:
enact
'pass as a law' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for enact that I've seen before include "Present" , "Official order" , "Make intoi law or perform a play" , "Put on stage or statute book" , "Make (a bill) law" .)