Establish measure with central facts (5)
I believe the answer is:
enact
'establish' is the definition.
(enacting is a kind of establishing)
'measure with central facts' is the wordplay.
'measure' becomes 'en' (typographical measure).
'with' is a charade indicator (letters next to each other).
'central' means to look at the middle letters.
The centre of 'facts' is 'act'.
'en'+'act'='ENACT'
(Other definitions for enact that I've seen before include "Bring in" , "Establish by statute" , "Make intoi law or perform a play" , "Play one's part" , "Decree" .)