Not just ugly (6)
I believe the answer is:
unfair
This clue could be a double definition.
'not just' is the first definition.
('unfair' is the opposite to 'just')
'ugly' is the second definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for unfair that I've seen before include "'Unjust, inequitable (6)'" , "deceitful" , "Unjust, partial" , "Not equitable - or blonde?" , "Not equitable or blond" .)