To put it concisely, soon (7)

I believe the answer is:

shortly

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'soon' is the definition.
(I know that soon can be written as shortly)

I can't explain the rest of the clue.

(Other definitions for shortly that I've seen before include "In a jiffy" , "Soon: in an abbreviated manner" , "Soon; sharply" .)

I've seen this clue in the Evening Standard.

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