I'd get a new tyre. It's not worth taking any risks.
Assuming that your car has got the original wheels, it will need a 175/65-14 tyre. Formula One Autocentres can supply and fit a budget tyre for just £32
https://www.f1autocentres.co.uk/car-tyres/index/175-65-R14-T/BUDGET/F1Autocentres-com-Tyre-82T/574
although I'd prefer to pay a bit more for a tyre with a better specification. (I paid £48 per tyre for a couple of really good spec tyres for my Saab from F1 recently. Note that you need to order online to get the best prices there).
The other place that I buy tyres from is Asda Tyres. (You order online and book a free fitting with a local firm at the same time). They can sometimes be a little bit cheaper than F1 (even when you get the tyres fitted at F1 anyway):
https://www.asdatyres.co.uk/
Black Circles (which operates in a similar way) also has plenty of fans here on AB:
https://www.blackcircles.com/