Really don't think Clemson stays unbeaten. Wake Forest lost by 6, NC State lost by 10, and Syracuse only lost by 6. None of those 3 are as good as UNC (who Clemson will have to face in championship game most likely).
Notre Dame though could make their season with a win, and it's in South Bend. Irish also just handled Syracuse on the road. They seem to have figured some things out and their defense is really solid (only UNC scored more than 28 on them and they won that game).
Clemson still also gets Louisville (5-3), Miami (4-4) but has talent on roster, and then South Carolina (Beamer ball might be enough). Weird year for Clemson, the offense is a top 20 in PPG but they've only scored over 35 in 3 games. Their defense is 21st in PA, but has only held 3 teams to under 20 all season.
TCU I think I'd take the bet they lose at least 1 game. Still have to play at Texas and the next week at Baylor and then they finish the season against Iowa State. That's 3 of the best 4 defenses in the Big 12 left to play and you get them in a row with 2 of them being road games. Not sure Dykes will have the depth to last.
So honestly for me at least I'd say the PAC-12 with Oregon, USC, & UCLA all sitting at 1 loss has the best shot to get in the 4th team. But I think a 2nd SEC team can sneak in over USC/UCLA...legit I think the Pac-12s best shot is Oregon with only the 1 loss to Georgia.