The most common and most likely answer to this crossword clue is the 9 letter word INSULATOR
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More clues leading to the result INSULATOR
Buddy explains!

The straight part
We know that "Plastic wire, for example" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case plastic wire, for example = insulator.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 INSULATOR mean?
INSULATOR noun- A substance that does not transmit heat (thermal insulator), sound (acoustic insulator) or electricity (electrical insulator).
- A non-conductive structure, coating or device that does not transmit sound, heat or electricity (see image)
- A person who installs insulation.