He’s a catch (3)
I believe the answer is:
ray
This might be a double definition.
'he's' is the first definition.
'a catch' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
Can you help me to learn more?
(Other definitions for ray that I've seen before include "A little light" , "Column of light on the fish?" , "Sunbeam or flat fish" , "A bright beam or flat fish" , "Beam of light or flat fish" .)