Like some bacon, variable in quality (7)
I believe the answer is:
streaky
I believe this clue is a double definition.
'like some bacon' is the first definition.
(I've seen this before)
'variable in quality' is the second definition.
(streaky can mean of unreliable quality)
(Other definitions for streaky that I've seen before include "Having lines of differing colours" , "of uneven quality" , "Like some bacon" , "sort of bacon" , "particular bacon?" .)