I tell sage about how to make laws (9)
I believe the answer is:
legislate
'to make laws' is the definition.
(I've seen this before)
'i tell sage about' is the wordplay.
'about' is an anagram indicator.
'i'+'tell'+'sage'='itellsage'
'itellsage' is an anagram of 'LEGISLATE'.
'how' acts as a link.
(Other definitions for legislate that I've seen before include "For what governments do" , "Pass laws" , "Make or enact laws" , "Make provision" , "Pass law" .)