Say law is broken constantly (6)
I believe the answer is:
always
'constantly' is the definition.
(I've seen this before)
'say law is broken' is the wordplay.
'is broken' indicates an anagram.
'say'+'law'='saylaw'
'saylaw' is an anagram of 'ALWAYS'.
(Other definitions for always that I've seen before include "Invariably" , "Eternally" , "Constantly" , "For good" , "Forevermore" .)