AT flops a TEN in a big pot. Unsure how to protect it.

[Cerril]

This may actually be a situation where you can't protect your hand. Like straight flush boards, even holding TPTK isn't too strong. You almost certinly have the best hand but you could be up against 8 or 9 collective outs on you, and if UTG has an overpair you're in more trouble. I might be tempted to bet/call with the intent to c/r a favorable turn and call down an unfavorable one.

If you think you can count on UTG to raise you here without an overpair, then I'm pretty happy with this action, especially if UTG's turn action wasn't unexpected. I'm pretty happy with the river, whether you dragged or not pretty much depends on whether it's a good day or bad one.