The most common and most likely answer to this crossword clue is the 5 letter word STEAL
I've seen this crossword clue in Financial Times
S
T
E
A
L
More clues leading to the result STEAL
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 = steal.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 STEAL mean?
STEAL noun- The act of stealing.
- A piece of merchandise available at a very attractive price.
- A situation in which a defensive player actively takes possession of the ball or puck from the opponent's team.
- A stolen base.
- Scoring in an end without the hammer.
- A policy in database systems that a database follows which allows a transaction to be written on nonvolatile storage before its commit occurs.
- To take illegally, or without the owner's permission, something owned by someone else.
- (of ideas, words, music, a look, credit, etc.) To appropriate without giving credit or acknowledgement.
- To get or effect surreptitiously or artfully.
- To acquire at a low price.
- To draw attention unexpectedly in (an entertainment), especially by being the outstanding performer. Usually used in the phrase steal the show.
- To move silently or secretly.
- To convey (something) clandestinely.
- To withdraw or convey (oneself) clandestinely.
- To advance safely to (another base) during the delivery of a pitch, without the aid of a hit, walk, passed ball, wild pitch, or defensive indifference.
- To dispossess
- To borrow for a short moment.