The most common and most likely answer to this crossword clue is the 6 letter word DEBARS
I've seen this crossword clue in Financial Times
D
E
B
A
R
S
Buddy explains!

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 DEBARS mean?
DEBARS verb- To exclude or shut out; to bar.
- To hinder or prevent.
- To prohibit (a person or company that has been convicted of criminal acts in connection with a government program) from future participation in that program.