The most common and most likely answer to this crossword clue is the 5 letter word COZEN
I've seen this crossword clue in The Times
C
O
Z
E
N
More clues leading to the result COZEN
Buddy explains!

The straight part
We know that "Swindle" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case swindle = cozen.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 COZEN mean?
COZEN verb- To become cozy; (by extension) to become acquainted, comfortable, or familiar with.
- To cheat; to defraud; to deceive, usually by small arts, or in a pitiful way.