Make law -- stick up document finally (5)
I believe the answer is:
Here is my best explanation:
'make law' is the definition.
(I've seen this before)
'stick up document finally' is the subsidiary indication.
'stick' becomes 'cane' (cane is a kind of stick**).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'finally' suggests the final letters.
The last letter of 'document' is 't'.
'cane' in reverse letter order is 'enac'.
(Other definitions for enact that I've seen before include "Ordain", "Pass into law", "Decree", "Perform (as if in a play)", "Play one's part", "Put into practice", "get into law", "Establish by law - perform", "Make intoi law or perform a play" and "Bring in".)