Curious to find what's in the bottle? (3)

I believe the answer is:

rum

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

I don't understand the remainder of the clue.

(Other definitions for rum that I've seen before include "Unusual" , "Bizarre" , "Odd kind of drink for sailor" , "Droll" , "Strange drink from molasses" .)

I've seen this clue in the Evening Standard.

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