Trish there is a repair option for your clay liner that will allow you to keep your wood burner.

One option is HeatShield®, a chimney liner repair system.

https://heatshieldchimney.com/

They claim credit for there technique but my father told me 25 years ago the old school repair for leaking joints and cracks in clay liner was to put a sand bag down the flue, dump the right cement on top of the sand bag and pull it up sealing all leaks, and similar to heatshields method.

Another option and what I used 21 year ago was a little more involved. Because my clay liner was already in bad shape when I bought the house the sandbag fix wouldn't work and I didn't want to go gas, not the same. I measured the inside diameter of the clay liner and had a sheet metal shop make a stainless steel rigid rectangular liner 1" smaller then the inside of the clay liner in 3 ft. sections, which I riveted together with stainless steel pop rivets. As far as I know there is no one who sells rectangular rigid liners but do sell round ones. The sheet metal shop knew exactly what I was doing and also added a radius in all four corners to match the clay liner radius.

When It got to the bottom I blocked the new liner and sealed the space between the clay liner and the new Stainless liner and From the top I poured a mixture of mortar and vermiculite down the space between the two while taping and shaking the new liner until it was full.

The results? I'm still burning wood. Just this week I decided to replace the crown on top my chimney and was able to inspect both liners, the Stainless from the inside and clay from the outside. The stainless looked like the day I put it in with all rivets in perfect shape. The clay liner was sealed up by the mortar/vermiculite mix and believe it will last 50+ years longer.

I know this is somewhat involved but it is an option. If you consider this option the mortar/vermiculite mix was 1 part mortar to 2 1/2 parts vermiculite by volume and must be soupy enough to poor. Vermiculite is a noncombustible loose insulation rated for over 2000 degrees. You don't need the mix, just drop in a custom built liner but the mix helps maintain flue temperatures for a better draft and reduced creosote buildup when it's really cold out.

A word of caution, the flue size is determined by the size of the fireplace or wood stove opening and the height of the chimney, and needs calculated to determine if you'll be able to do it.

I had to do the rectangular size to get the proper amount of square inches to match my burner. Your burner may vary and may be able to use a round liner. Refer to this web site or other sources.

https://www.lindemannchimneysupply.com/determining-fireplace-liner-sizing