What is a banjostring in the first place?

If you are speaking about an actual banjo string like on the stringed instrument. Yes, clip it and then remove the string from the neck and bridge and then replace it with the same size and tune.

Since you don't know if you can clip it or not, take it to a professonial and have it done correctly.

Take that as advice for both stringed instruments and if this is a serious medical question then go to the doctors to see what needs to be done. Don't do surgery on yourself!!!!!