It can be drawn in red
I believe the answer is:
blood
'drawn in red' is the definition.
The definition and answer can be both human attributes as well as being singular nouns.
Maybe there's a link between them I don't understand?
'it can' is the wordplay.
I cannot quite understand how this works, but
'can' could be 'loo' (slang) and 'loo' is present in the answer.
This may be the basis of clue (or it may be nonsense).
'be' acts as a link.
Can you help me to learn more?
(Other definitions for blood that I've seen before include "Fiery temperament" , "Male siblings -- sworn friends" , "Recorded and respected ancestry" , "Oxygen carrier" , "Kinship; temperament" .)