Two-faced god
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 "Two-faced Roman god of doors (5)" , "Two-faced person" , "Two-faced Roman god who guarded doors and gates" , "Two-faced deity" , "Roman god of doors and beginnings" .)