
1) American comic strip 2) English-language slang 3) Knockout drink 4) Loaded cocktail
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https://www.crosswordclues.com/clue/mickey-finn
[comic strip] Mickey Finn was an American comic strip created by cartoonist Lank Leonard, which was syndicated to newspapers from 1936 to 1976. The successful lighthearted strip struck a balance between comedy and drama. It was adapted to a 400-page Little Big Book and was reprinted in several comic book series throughout the 1930s and 1940...
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http://en.wikipedia.org/wiki/Mickey_Finn_(comic_strip)
[drugs] In slang, a Mickey Finn (or simply Mickey) is a drink laced with a drug (especially chloral hydrate) given to someone without their knowledge in order to incapacitate them. Serving someone a Mickey is most commonly referred to as slipping someone a mickey, but it is sometimes spelled `mickie`. == History of term == ===Michael `Micke...
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http://en.wikipedia.org/wiki/Mickey_Finn_(drugs)
[guitarist] Mickey Waller (3 March 1947 – 1 February 2013), also known by the stage name Mickey Finn, was an English guitarist. He started out with instrumental band `The Strangers` in Bethnal Green, East London, in the Summer of 1961. In 1963 Waller adopted the name Mickey Finn - after having heard about the drummer named Micky Waller - ...
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http://en.wikipedia.org/wiki/Mickey_Finn_(guitarist)
[inventor] Charles A. `Mickey` Finn (June 21, 1938 – April 24, 2007) was an American inventor who specialized in designing and producing weapons systems for the U.S. military. He retired from defense work and began designing sporting equipment, including the Mickey Finn T-Bar Putter, a golf putter. == Background == For thirty years Finn d...
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http://en.wikipedia.org/wiki/Mickey_Finn_(inventor)

Mickey Finn is slang for a drink containing a drug to make the drinker unconscious, usually formed by the combination of chloral hydrate and alcohol.
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http://www.probertencyclopaedia.com/browse/ZM.HTM
noun slang term for knockout drops
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https://www.encyclo.co.uk/local/20974
No exact match found.