Might he be a little light? (5)
I believe the answer is:
pilot
This could be a double definition.
'might he' is the first definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'a little light?' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'be' acts as a link.
Can you help me to learn more?
(Other definitions for pilot that I've seen before include "This person can be found in a plane or a boat" , "Ship's guide" , "Driver of aircraft" , "Plane operator" , "air traffic controller?" .)