Odd enough to start you ruminating (3)

I believe the answer is:

rum

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'odd' is the definition.
(rum can mean strange or dubious)

I can't explain the rest of the clue.

(Other definitions for rum that I've seen before include "An odd kind of drink made from molasses" , "Odd, like sailor's drink" , "Droll" , "Funny" , "The spirit is peculiar" .)

I've seen this clue in the Evening Standard.

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