The most common and most likely answer to this crossword clue is the 4 letter word SCAM
I've seen this crossword clue in The Guardian
S
C
A
M
More clues leading to the result SCAM
- Rascal’s endless swindle
- Rip off raincoats to throw back
- Monkey endlessly makes a racket
- Last in Oaks? You can have a punt on it but it’s a fiddle!
- Trickery from monkey scratching rear
- Scotsman's recalled fraudster's business
- Curtailed rascal's swindle
- Man or woman ringing about fiddle
- Seafood, not very good, can give you gyp
- Penny extracted from villain's fraud
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 SCAM mean?
SCAM noun- A fraudulent deal.
- Something that is promoted using scams.
- To defraud or embezzle.