1)
Do they eat the Chelev?
1.
Radak: They eat the best of the flock. I.e. they take their money without justification.
2.
Radak citing Targum Yonasan: You eat the good, wear clean wool and slaughter the fat [animals] and you do not lead the nation.
3.
They eat the milk. (Malbim implies like this. He explained, you slaughter the fat ones, even though you can benefit from the shearings and milk [and leave the animals intact. - PF]
2)
What is "ha'Beri'ah"?
1.
Radak: It is fat, like "v'Eglon Ish Bari Me'od" (Shoftim 3:17), "Lehavri'achem me'Reishis Kol Minchas Yisrael" (Shmuel I, 2:29)
