Auguries (5)
'auguries' is the definition.
(omen is a kind of augury)
This is all the clue.
(Other definitions for omens that I've seen before include "Signs of things to come" , "Portents, prophetic signs" , "Augurs" , "Prophetic signs of good or evil" , "Auguries" .)
(Other definitions for signs that I've seen before include "Sings (anag.)" , "Autographs" , "Signals" , "Badges" , "Indications" .)