The most common and most likely answer to this crossword clue is the 8 letter word TRESPASS
I've seen this crossword clue in The Times
T
R
E
S
P
A
S
S
More clues leading to the result TRESPASS
- Sin of fool turning up in something hairy
- Intrude in health resort, breaking lock?
- A stress developed about parking invasion
- Wrong lock of hair Dad’s cut
- Invade health resort, cutting lock
- Intrude in resort, breaking lock
- Wrong spring in lock
- Old man’s appearing in Hair – it’s a sin!
- Tories: oi, out! Leave behind old-fashioned sin
- Very French attempt to seduce is wrong, legally
Buddy explains!

The straight part
We know that "Sin" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sin = trespass.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 TRESPASS mean?
TRESPASS noun- An intentional interference with another's property or person.
- Sin
- To commit an offence; to sin.
- To offend against, to wrong (someone).
- To go too far; to put someone to inconvenience by demand or importunity; to intrude.
- To enter someone else's property illegally.
- To pass beyond a limit or boundary; hence, to depart; to go.
- To decree that a person shall be arrested for trespassing if he or she returns to someone else's land.