Neverending excursion? (5)

I believe the answer is:

foray

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'excursion?' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe there's a link between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for foray that I've seen before include "Raid or incursion" , "Assault" , "Raid into enemy territory" , "Sortie" , "Brief incursion" .)

I've seen this clue in The Independent.

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