Coffee when you can't wait? (7)

I believe the answer is:

instant

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'coffee' is the definition.
(instant coffee)

I can't explain the rest of the clue.

(Other definitions for instant that I've seen before include "like some coffee?" , "Short time, of the current month" , "type of coffee" , "Happening immediately" , "This coffee is made from powder" .)

I've seen this clue in The Sun.

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