Dashing young man known as a Red? (5)
I believe the answer is:
blood
'red?' is the definition.
The definition and answer can be both human attributes as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for blood that I've seen before include "Recorded and respected ancestry" , "It's said to be thicker than water" , "Fluid in veins" , "It contains plasma and platelets" , "Oxygen carrier" .)