Good and bad (6)
I believe the answer is:
wicked
I believe this is a double definition.
'good' is the first definition.
(thesaurus)
'bad' is the second definition.
('wicked' can be similar in meaning to 'bad')
'and' acts as a link.
(Other definitions for wicked that I've seen before include "show" , "[SMASHING, COOL, DANDY]" , "Evil; musical" , "Absorbed in enchanting" , "A candle is" .)