A rainbow may be seen as a good one (4)
I believe the answer is:
omen
(Other definitions for omen that I've seen before include "Gloomy sign" , "Sign of likely future event" , "Augur" , "Forewarning, harbinger" , "Straw in the wind" .)
I believe the answer is:
omen
(Other definitions for omen that I've seen before include "Gloomy sign" , "Sign of likely future event" , "Augur" , "Forewarning, harbinger" , "Straw in the wind" .)