Downfall for Narcissus (7)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
conceit
(Other definitions for conceit that I've seen before include "Fanciful notion; self-pride" , "Excessive self-esteem" , "Excessive self-pride" , "Excessive pride; fancy" , "Vanity; fanciful notion" .)