Worthless empty territory contains outbreak (6)
I believe the answer is:
trashy
'worthless' is the definition.
(trashy can mean of poor quality)
'empty territory contains outbreak' is the wordplay.
'empty' means to remove the middle letters.
'contains' means one lot of letters goes inside another.
'outbreak' becomes 'rash' (rash can mean a sudden outbreak).
'territory' with its centre taken out is 'ty'.
'ty' enclosing 'rash' is 'TRASHY'.
(Other definitions for trashy that I've seen before include "Cheap - garish" , "Shoddy or ganger" , "Shoddy and worthless" , "Shy art - rubbishy" , "Useless" .)