Weirdly, Oscar had first drink and duly forgot you (5)

I believe the answer is:

oddly

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'weirdly' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for oddly that I've seen before include "In a peculiar way" , "In a strange way" , "Weirdly" , "in a curious way" , "Strangely, curiously" .)

I've seen this clue in the Sydney Morning Herald.

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