I know I’m not Margaret but I’ll put in my 2cents Dennis! I’d gently knock it out of the pot and take a look at the root ball. If its really pot-bound, I’d pot it up into a slightly larger pot (no more than a couple of inches larger in diameter), thereby re-arranging the bottom roots so they’re tucked back into the soil in the new planter. If the plant doesn’t appear to be really well rooted (I actually doubt this, after being outside all summer), I would scratch away some of the soil at the escaping roots and put it back into its original pot, with some new soil added to the bottom. I find that my over-wintering tender plants don’t do much growing until the days turn longer again in the spring and the rule is not to re-pot late in the season, so as not to encourage new growth. If it were me I wouldn’t cut off those roots! Good luck!