The most common and most likely answer to this crossword clue is the 8 letter word NECKLINE
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More clues leading to the result NECKLINE
Buddy explains!
The straight part
We know that "plunger" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case plunger = neckline.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 NECKLINE mean?
NECKLINE noun- The line formed by the edge of an article of clothing that surrounds the neck, especially as seen at the front.