The most common and most likely answer to this crossword clue is the 6 letter word THIEVE
I've seen this crossword clue in The Times
T
H
I
E
V
E
More clues leading to the result THIEVE
- Rogue I've confined to the nick
- Take things easy at first — in time place very busy
- Appropriate article that is very penetrating
- Nick, youth I eventually ensnare
- I’ve changed in the nick
- Pinch article about one empty vehicle
- Article about that is very appropriate
- Knock off bag
- Steal hearts in match against Spain
- Take things the wrong way
Buddy explains!

The straight part
We know that "nick" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case nick = thieve.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 THIEVE mean?
THIEVE verb- To commit theft.