Like that Baconian theory, a bit unreliable (7)

I believe the answer is:

streaky

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'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" .)

I've seen this clue in the Evening Standard.

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