To amputate someone's arm or leg means to cut all or part of it off in an operation because it is diseased or badly damaged.
①To save his life, doctors amputated his legs.
②He had to have one leg amputated above the knee.
clock in at
If something such as a CD or film clocks in at a particular amount of time, it is that amount of time long.
There are four more songs, each clocking in at around 12 minutes.
《新闻周刊》一篇题为 Biden's student loan forgiveness will make things worse 也出现了这个表达：