The Eleventh Circuit has taken up the definition of a particular social group (PSG) now that deference is no longer due to the agency. In so doing, the Court declined to create a comprehensive definition, but affirmed that a PSG would be defined by immutability, identity, visibility, homogeneity, and cohesiveness.
The full text of Mejia Ponce v. Attorney General can be found here:
https://media.ca11.uscourts.gov/opinions/pub/files/202314124.pdf