In short, a Simpsonian title? (4)

I believe the answer is:

bart

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'in' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for bart that I've seen before include "Small title-holder being a brat" , "Homer's son" , "Branch of Islam" , "Son in The Simpsons" .)

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