Serendipity, I had the same problem with Star, the vets did them once for me in lockdown when they saw her and Twinkle. But within a few weeks they were long again. I tried with nail scissors- did not work. I got these from amazon:
https://smile.amazon.co.uk/gp/produc...?ie=UTF8&psc=1
I have managed to do a few nails each time and she is a squirmy devil in her old age.
I also have styptic powder in case of god forbid a little mishap.