The most common and most likely answer to this crossword clue is the 4 letter word VETS
V
E
T
S
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 VETS mean?
VETS noun- A veterinarian or veterinary surgeon.
- A veteran (a former soldier or other member of an armed forces).
- To thoroughly check or investigate particularly with regard to providing formal approval.