The most common and most likely answer to this crossword clue is the 7 letter word DEBAUCH
I've seen this crossword clue in The Guardian
D
E
B
A
U
C
H
Buddy explains!

The straight part
We know that "corrupt" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case corrupt = debauch.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 DEBAUCH mean?
DEBAUCH noun- An individual act of debauchery.
- An orgy.
- To morally corrupt (someone); to seduce.
- To debase (something); to lower the value of (something).
- To indulge in revelry.