Deceitful, like Janus? (3-5)
I believe the answer is:
two-faced
I believe this is a double definition.
'deceitful' is the first definition.
(I know that deceitful can be written as two-faced)
'like janus?' is the second definition.
(the Roman god Janus had two faces)
(Other definitions for two-faced that I've seen before include "Double-meaning" , "Deceitful, with double visage" , "Treacherous" , "Duplicitous" , "Hypocritical (like clock in tower?)" .)