The most common and most likely answer to this crossword clue is the 4 letter word JIFF
I've seen this crossword clue in Independent
J
I
F
F
More clues leading to the result JIFF
Buddy explains!

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 JIFF mean?
JIFF noun- A jiffy; a moment; a short time.
- To deceive, swindle, trick