A particle must have mass in order for you to regard it as a a clock, and photons don’t. And particles that do have mass never move at 1.0*c. That wall between “almost the speed of light” and “exactly the speed of light” is absolutely inviolable.
https://www.quora.com/If-time-stops-at-the-speed-of-light-then-how-can-anything-move-at-that-point
You can’t even properly define a frame of reference that moves relative to you at the speed of light....
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