Like that Baconian theory, a bit unreliable (7)
I believe the answer is:
streaky
'like' is the definition.
Both the answer and definition are adjectives. Perhaps you can see an association between them that I don't see?
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for streaky that I've seen before include "Having lines of differing colours" , "particular bacon?" , "sort of bacon" , "of uneven quality" , "Like some bacon" .)