Cold colour (4)
I believe the answer is:
blue
This clue might be a double definition.
'cold' is the first definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe there's a link between them I don't understand?
'colour' is the second definition.
(blue is a colour)
Can you help me to learn more?
(Other definitions for blue that I've seen before include "Indecent" , "Primary colour" , "Vulgar" , "University sportsman - a shade - depressed" , "Varsity sportsman" .)