How to make so if a object is clicked it gets deleted after 5 seconds?

Okay you clearly know nothing about ROBLOX Lua, and didn't attempt to solve this yourself.

BUT HEY I feel nice today.

script.Parent.MouseMouseButton1Click:Connect(function()
wait(5)
YourObjectNameHere:Destroy()
end

put this script inside the object you want to destroy() clickdetector

You Can use ClickDetectors for that. Right Click the Object you want to be deleted within 5 seconds (in the Explorer) Hover your mouse to [Insert Object] Insert an [ClickDetector] into the Object

Now insert a Script into the Object Write this Code on the Script:

local Object = script.Parent
local ClickDetector = Object:WaitForChild('ClickDetector')
ClickDetector.MouseClick:Connect(function(Player) --You won't use "Player", its optional.
    ClickDetector:Destroy() --Removes the ClickDetector, so it can't be clicked Again
    wait(5) --How Many Seconds before the Object gets Removed?
    Object:Destroy() --Remove the Object
end)

Instead of CTRL+C and CTRL+V, Study how the Code works and experiment it!