Legislation does something (4)
I believe the answer is:
acts
This clue is a double definition.
'legislation' is the first definition.
(I've seen this before)
'does something' is the second definition.
('act' can be a synonym of 'do something')
(Other definitions for acts that I've seen before include "appears (eight in a series may be found)" , "Deeds; NT book" , "individual performers in a show" , "Dramatic parts" , "Major divisions of play" .)