Funny thing to find in a bottle (3)

I believe the answer is:

rum

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'funny' is the definition.
(I know that funny can be written as rum)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for rum that I've seen before include "Spirit (in the punch?)" , "tipple" , "Queer" , "Unusual" , "Odd like drink distilled from molasses" .)

I've seen this clue in the Evening Standard.

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