The most common and most likely answer to this crossword clue is the 10 letter word MOUNTEBANK
I've seen this crossword clue in The Times
M
O
U
N
T
E
B
A
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K
More clues leading to the result MOUNTEBANK
- Fraudster to launch Internet loan provider
- Charlatan, one eluding policeman at store
- Swindler set up online financial service
- Card game in which universal inclination for fraud
- Buffoon displaying energy between two hills
- Anyone can come to enter card game with inclination for fraud
- One taken for a ride, English money-holder being a charlatan
Buddy explains!

The straight part
We know that "Fraudster" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fraudster = mountebank.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 MOUNTEBANK mean?
MOUNTEBANK noun- One who sells dubious medicines.
- One who sells by deception; a con artist; a charlatan.
- An acrobat.
- To act as a mountebank.
- To cheat by boasting and false pretenses.