Well if my memory serves me well the key to solve thw clock mystery is depend on you, but i suggest to spam click everything inside your house and i mean everything including the paintings and sort of stuffs. Thats the key man spam click every item that you can see INSIDE of your home
Well if you're aware to access the attic you need to go to ivy's room(MC's main chick) then try to spam click the attic. Well the attic is not that easy to see but if look up in Ivy's room you will see something different. Let me now if thats helpful men.
I am already at the "below" area, the area that has green walls and thicc mummies.. and i arleady aquire the old key, the question is where is the door for the old key?
You can get ancient sap inside the dungeon lad, but first if you want to unlock dungeon go to ivy's room in the morning there you can access to attic and the rest is up to you my friend.