The most common and most likely answer to this crossword clue is the 10 letter word ACCOUNTING
I've seen this crossword clue in Financial Times
A
C
C
O
U
N
T
I
N
G
Buddy explains!

The straight part
We know that "Finance" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case finance = accounting.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 ACCOUNTING mean?
ACCOUNTING verb- To provide explanation.
- To count.
- The development and use of a system for recording and analyzing the financial transactions and financial status of an individual or a business.
- A relaying of events; justification of actions.
- An equitable remedy requiring wrongfully obtained profits to be distributed to those who deserve them.
- Of or relating to accounting.