The most common and most likely answer to this crossword clue is the 7 letter word GARBLES
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The straight part
We know that "Makes corrupt" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case makes corrupt = garbles.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 GARBLES mean?
GARBLES verb- To pick out such parts (of a text) as may serve a purpose; to mutilate; to pervert
- To make false by mutilation or addition
- To sift or bolt, to separate the fine or valuable parts of from the coarse and useless parts, or from dross or dirt