Crossword Genius

People are genuinely moved by its high-wire performance (7,3)

Ross

I believe the answer is:

trolley bus

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'people are' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for trolley bus that I've seen is " Electrically driven public service vehicle".)

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