Attorney's profession (3)
I believe the answer is:
law
'attorney's profession' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for law that I've seen before include "Edict" , "Body of rules of conduct for a society" , "Set of rules laid down by authority" , "'Possession is nine points of the ...'" , "Collection of rules for a society" .)