Raid that's short but seems everlasting (5)

I believe the answer is:

foray

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'raid' is the definition.
(I know that raid can be written as foray)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for foray that I've seen before include "Assault" , ".A sudden attack or raid" , "Depredation" , "Brief incursion" , "Sudden short attack" .)

I've seen this clue in The Globe and Mail.

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