Marriageable fellow failed to attend a ceremony, you hear (2,5)
I believe the answer is:
mr right
If this is the answer, I'm afraid I cannot explain it.
Can you help me to learn more?
(Other definitions for mr right that I've seen before include "Utopian potential husband?" , "Ideal union candidate" , "Perfect husband" , "Ideal man" , "Perfect man (for someone)" .)