Crossword Genius

Bats on regardless, ultimately inconsistent (6)

Ross

I believe the answer is:

spotty

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'inconsistent' is the definition.
(similar in meaning)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for spotty that I've seen before include "Adolescent boys are often so" , "Teenagers are often so" , "Pimply or covered with dots" , "Maculate (like a leopard?)" , "Covered in rash" .)

I've seen this clue in The Times.
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