Just not dark (4)
I believe the answer is:
fair
This clue could be a double definition.
'just' is the first definition.
(just can mean fair in the sense of showing justice)
'dark' is the second definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?
'not' is the link.
Can you help me to learn more?
(Other definitions for fair that I've seen before include "Just; amusement" , "Just; beautiful; blond" , "light headed" , "[OPPOSITE OF] Dark" , "Traders' gathering" .)