"It's a ___" (2021 miniseries chronicling the AIDS crisis) (3)

I think it could be either:

boy

sin

(Other definitions for sin that I've seen before include "Go astray" , "Evil" , "Moral offence" , "Depravity" , "Wrongdoing" .)

I've seen this clue in The New York Times and the Penny Press.

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