The most common and most likely answer to this crossword clue is the 11 letter word ACCOUNTANTS
I've seen this crossword clue in The Guardian
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Buddy explains!
The straight part
We know that "Financial experts" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case financial experts = accountants.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 ACCOUNTANTS mean?
ACCOUNTANTS noun- One who renders account; one accountable.
- A reckoner, or someone who maintains financial matters for a person(s).
- One who is skilled in, keeps, or adjusts, accounts; an officer in a public office, who has charge of the accounts.
- One whose profession includes organizing, maintaining and auditing the records of another. The records are usually, but not always, financial records.