Ultimately, gnats and bats like Bengal cats? (6)

I believe the answer is:

spotty

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'bats like bengal cats?' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for spotty that I've seen before include "Teenagers are often so" , "Suffering as a teenager" , "Freckled" , "irregular" , "covered in pimples" .)

I've seen this clue in The Guardian.

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