Mr X? (3)
I believe the answer is:
ray
This might be a double definition.
'mr' is the first definition.
'x?' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
Can you help me to learn more?
(Other definitions for ray that I've seen before include "may be electric" , "Second note for the flat fish" , "Narrow beam of light" , "Flatfish or sunbeam" , "beamer?" .)