unsure if clock bracket is the right name for it, the mirrors also bolt into it. Mine was snapped when I bought the bike and at track speeds the screen gets wobbly.
Whisbone shaped black cast alloy bracket that supports the clocks and extends out to support the front fairing where the mirror mounts are.? That'll be it then. They're prone to snapping in decent crash, as they're fairly brittle being cast alloy. I've got three.! One that I broke at Donnington. One that I broke at Cadwell, that I alloy welded together & is currently on my bike One that I brought as a replacement when I broke the second one, that I only fit when she's wearing her best road clothes. For track use it's probably a good idea to go for an aftermarket one, as they're fabricated from tube & plate instead of a casting, and therefore can usually be bent back into shape when they take a knock. Or Alloy Mig weld your existing broken one, if you have the kit/inclination.
You could try posting up a wanted thread on here, or there are usually ones available from sellers on eBay & suppliers like UK Race support if you want one straight away.
Is there an engineering shop or similar near you who could weld it up? If its a track bike you aren't too worried how it looks? They are a weak point in a crash!