About to enter the facts, is new to it (5)
I believe the answer is:
Here is my best explanation:
'new to it' is the definition.
I can't tell whether this defines the answer.
'about to enter the facts' is the wordplay.
'about' becomes 're' (regarding**).
'to enter' indicates putting letters inside.
'the facts' becomes 'gen'.
're' placed inside 'gen' is 'GREEN'.
'is' is the link.
(Other definitions for green that I've seen before include "Party label", "bowlers here?", "Raw - inexperienced", "personification of envy", "Consultative document", "The colour of immaturity", "Village space", "Inexperienced; colour", "Fresh - environmentally friendly - colour" and "Area around a golf hole".)