The most common and most likely answer to this crossword clue is the 6 letter word FIXERS
I've seen this crossword clue in Financial Times
F
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X
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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 FIXERS mean?
FIXERS noun- Agent noun of fix; one who, or that which, fixes.
- A chemical (sodium thiosulfate) used in photographic development that fixes the image in place, preventing further chemical reactions.
- (criminal justice) A person who arranges immunity for defendants by tampering with the justice system via bribery or extortion, especially as a business endeavor for profit.
- A person who assists foreign journalists in volatile countries, often providing interpretation, personal connections, and transportation services.
- A fixer-upper.