Enterprise, say, in plot assisted those who wait (6)

I believe the answer is:

bussed

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'assisted those who wait' is the definition.
Although both the answer and definition are past participle verbs, I don't see how they can define each other.

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

Can you help me to learn more?

(Another definition for bussed that I've seen is " transported by coach".)

I've seen this clue in The Times and The Sunday Times.

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