I am puzzled, as I seem to remember watching it as a kid and the ending was something about the maid being the cook(?) in disguise. I especially remember her having a set of fake, long legs in a suitcase.
As I suspected this is from an entirely different movie Murder by Death (1976) where.... "The cook is also discovered to have been an animated ...
While 'Murder by Death' is also an excellent 'whodunnit' murder mystery, it has only one ending.
'Clue' has three endings. Here's an article on it:
I own both movies on DVD and can confirm it features three different endings.