Q.Draining in clay soil
I have tubes from my gutters going to a hole I dug 3 feet deep. Water doesn’t drain from this hole very fast because of the clay. Would it help to pour a couple of bags of gymsum in this hole to eat at the clay? How could I have this drain faster?

I can give information on amending soil in regards to planting and gardening but you will need to consult with a building or contractor for information on adequately draining water from your home.
When amending clay soil, you will need to work the added organic material into the soil, either by hand or equipment such as a tiller.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/how-to-improve-clay-soil.htm