Now penning Chapter One, and being prophetic? (9)
I believe the answer is:
prescient
'being prophetic?' is the definition.
(thesaurus)
'now penning chapter one' is the wordplay.
'now' becomes 'present' (I've seen this before).
'penning' is an insertion indicator.
'chapter' becomes 'c'.
'one' becomes 'i' (Roman numeral).
'c'+'i'='ci'
'present' enclosing 'ci' is 'PRESCIENT'.
'and' acts as a link.
(Other definitions for prescient that I've seen before include "Able to predict events" , "Showing knowledge of events before they take place" , "Having foreknowledge" , "Reinspect, having foresight" , "Certainly dealing in futures" .)