About to enter the facts, is new to it (5)
I believe the answer is:
green
'new to it' is the definition.
I can't tell whether this definition defines the answer.
'about to enter the facts' is the wordplay.
'about' becomes 're' (regarding).
'to enter' is an insertion indicator.
'the facts' becomes 'gen'.
're' going within 'gen' is 'GREEN'.
'is' is the link.
Can you help me to learn more?
(Other definitions for green that I've seen before include "one of eighteen" , "Common, inexperienced" , "Village space" , "Ecologically correct" , "17's colour" .)