The most common and most likely answer to this crossword clue is the 7 letter word TRASHES
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Buddy explains!
The straight part
We know that "vandalises" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case vandalises = trashes.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 TRASHES mean?
TRASHES noun- Useless things to be discarded; rubbish; refuse.
- A container into which things are discarded.
- Something worthless or of poor quality.
- People of low social status or class. (See, for example, white trash or Eurotrash.)
- A fan who is excessively obsessed with their fandom and its fanworks.
- Temporary storage on disk for files that the user has deleted, allowing them to be recovered if necessary.
- A collar, leash, or halter used to restrain a dog in pursuing game.
- To discard.
- To make into a mess.
- To beat soundly in a game.
- To disrespect someone or something
- To free from trash, or worthless matter; hence, to lop; to crop.
- To treat as trash, or worthless matter; hence, to spurn, humiliate, or crush.
- To hold back by a trash or leash, as a dog in pursuing game; hence, to retard, encumber, or restrain; to clog; to hinder vexatiously.