Red, green, blue or black card? (7)
I believe the answer is:
oddball
This clue could be a double definition.
'red green blue' is the first definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'black card?' is the second definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?
'or' acts as a link.
Can you help me to learn more?
(Other definitions for oddball that I've seen before include "Eccentric 32" , "Crank" , "Weirdo" , "Eccentric character" , "Eccentric person like peculiar sphere" .)