Excursion for go-getters? (4)

I believe the answer is:

raid

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'excursion' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for raid that I've seen before include "Inroad" , "Sudden short attack" , "bust" , "Search by police without warning" , "Rapid surprise attack" .)

I've seen this clue in the Evening Standard.

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