Hold time and voltage maximum analysis for D flip-flop?
This approach is not going to work. You have no relationship in your circuit between the 12 MHz clock, and the incoming signal (which I assume is a nominal square wave, but this doesn't change much).

This means that for any particular input edge, you have no idea where the clock edge will fall, and if you will see a setup/hold violation.

The correct approach here is to cascade your flop with another flop. Although the first flop may not get a clean input, it will resolve to one of the two legal states. The second flop then gets a dramatically improved setup/hold at it's input. The cost here is increased latency - it takes 2 clock cycles on average to sample the input change (could also be 1 or 3).

Metastability affects the flops flowing this one more significantly than the capture flop.