The most common and most likely answer to this crossword clue is the 8 letter word TROLLEYS
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Buddy explains!

The straight part
We know that "Pushcarts" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pushcarts = trolleys.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does TROLLEYS mean?
TROLLEYS noun- A cart or shopping cart.
- A hand truck.
- A soapbox car.
- A gurney.
- A single-pole device for collecting electrical current from an overhead electrical line usually for a tram or streetcar. Usually called a trolley pole.
- A streetcar or a system of streetcars.
- A light rail system or a train on such a system.
- A truck from which the load is suspended in some kinds of cranes.
- A truck which travels along the fixed conductors in an electric railway, and forms a means of connection between them and a railway car.
- To bring to by trolley.
- To use a trolley vehicle to go from one place to another.