Ok, this is not really one-handed, and it’s not a perfect solution, but I found it very helpful. The fingers of my weak hand are curled and my wrist cannot stay in a predictable positions, so it’s helpful if the nail clipper can rotate.

Here is the link: https://www.amazon.com/Stainless-Fingernail-Toenail-Clipper-Trimmer/dp/B01IC1O6BC/ref=sr_1_5?crid=1ZPNRHEL9DAOX&keywords=rotating+nail+clipper&qid=1653495700&sprefix=rotating+nail+clipper%2Caps%2C57&sr=8-5