The most common and most likely answer to this crossword clue is the 5 letter word SCART
S
C
A
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T
More clues leading to the result SCART
Buddy explains!

The straight part
We know that "plug" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case plug = scart.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 SCART mean?
SCART noun- A slight wound.
- A dash or stroke.
- A niggard.
- A poor-looking creature; a wretch.
- To scratch or scrape.