Any similar movies?

High Spirits (1988) has a similar vibe but I think is even better, Haunted Honeymoon (1986) also but not as good as either. Oscar (1991) reminds me of Clue somewhat as well but stands alone in its unique brilliance.

I've never seen "Gosford Park" but the description makes it sound like it could be similar- not sure though???

Glad I'm not the only one who associates Murder by Death with Clue... 

And Then There Were None

I don't know Clue but I know murder by death. If you liked that, you might like The cat and the canary http://www.imdb.com/title/tt0077304 too.
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Never argue with an idiot. They drag you down to their level then beat you with experience.

Yes murder by death is a great flick that clue is kind of in the same vein. Both great in their own ways, highly recommend seeing each to compare.

Try The Cheap Detective. Peter Falk, and a whole bunch of talented actors. It's a take off on The Maltese Falcon, but also other 1940's movies.

If you loved Clue and Murder by Death you will love Sleuth and Deathtrap!

Very similar setting with whodunit plot with witty banter.

Sleuth (1972)
http://www.imdb.com/title/tt0069281/
Deathtrap (1982)
http://www.imdb.com/title/tt0083806/?ref_=tt_rec_tt