People are genuinely moved by its high-wire performance (7,3)
I believe the answer is:
Here is my best explanation:
'people are' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
I cannot understand how the rest of the clue works.
(Other definitions for trolley bus that I've seen before include "Electrically driven public service vehicle" and "Vehicle".)