The end of the said potty is missing (5)
I believe the answer is:
death
'the end' is the definition.
(the end of a life)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for death that I've seen before include "Loss of life" , "Last moment of existence" , "Hated (anag) -- expiry" , "The grim reaper" , "Cessation of life" .)