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@Ndeipi
^^ Yeah no biggie, you just need a replacement seatpost clamp with an ID (internal diameter) to match the ED (external diameter) of the top of your seatpost. For this you'll need a set of digital calipers, it shouldn't be too hard to find.
This is assuming that the clamp comes off the frame. A close inspection for seams and perhaps a few careful upwards taps with a hammer should tell you. If the clamp is part of the frame then fixing it will be much more difficult.
If you're in a rush to make this criterium tomorrow then just pop into your LBS, have them take off the clamp, measure your post and sell you a replacement clamp. Should take 15 minutes max, and £10-20.