The most common and most likely answer to this crossword clue is the 4 letter word VISE
V
I
S
E
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 VISE mean?
VISE noun- An instrument consisting of two jaws, closing by a screw, lever, cam, or the like, for holding work, as in filing.
- To clamp with or as with a vise.
- To examine and endorse (a passport, etc.); to visa.