Hello, Yes...clogged laundry tub. Have seen and cleaned hundreds of them!
If you have a removable trap under the LT, then remove it, and clean it out. It will be full of washer lint. Quick fix for the washer drain hose... best and cheapest thing, a womans pair of nylons (pantyhose) Only need one side of the leg. LOL Attach them to the end of the discharge hose it will catch 99% or the laundry lint, allowing water to flow without a problem. Cheap and easy, thats if you dont have to buy the pantyhose.
Hope this helps.