Possess dress that's not good (3)
I believe the answer is:
own
'possess' is the definition.
('own' can be a synonym of 'possess')
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for own that I've seen before include "Allow" , "Control" , "Personal; possess" , "Posses" , "Acknowledge" .)