Today, a word of warning? (3)

I believe the answer is:

now

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'today' is the definition.
('now' can be a synonym of 'today')

I cannot understand how the rest of the clue works.

(Other definitions for now that I've seen before include "straight away" , "Immediately" , "At this moment in time" , "At present, this instant" , "The present moment" .)

I've seen this clue in the Evening Standard.

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