Two-faced god (5)
I believe the answer is:
janus
'two-faced god' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for janus that I've seen before include "Roman god of doors and beginnings" , "Roman god of doors, usually two-faced - a month is named for him" , "Two-faced Roman god of doors (5)" , "Two-faced person" , "Two-faced deity" .)