Like Janus? (3-5)
I believe the answer is:
two-faced
'like janus?' is the definition.
(the Roman god Janus had two faces)
This is all the clue.
(Other definitions for two-faced that I've seen before include "Hypocritical (like clock in tower?)" , "Double-meaning" , "Deceitful or insincere - on the double?" , "Double-dealing, like Janus?" , "Showing a double-sided visage to deceive" .)