The most common and most likely answer to this crossword clue is the 7 letter word BURGLAR
I've seen this crossword clue in The Daily Telegraph
B
U
R
G
L
A
R
More clues leading to the result BURGLAR
- Thief left food all over car that hasn’t started
- Criminal destruction of half of Salzburg cellar
- Criminal in trouble, run in by US city’s Republican leader
- Criminal in fret returning unfriendly look when stopped
- House discontentment caused by such a criminal?
- Food returned, mostly fat, for a nicker
- House breaker caught in St. Petersburg larceny
- One might nick food rejected by the French right
- Criminal’s food sent back; mostly fat
Buddy explains!

The straight part
We know that "One might nick" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one might nick = burglar.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 BURGLAR mean?
BURGLAR noun- A person who breaks in to premises with the intent of committing theft
- To commit burglary; to burgle.