The most common and most likely answer to this crossword clue is the 4 letter word SPAY
S
P
A
Y
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 SPAY mean?
SPAY verb- To remove or destroy the ovaries (of an animal) so that it cannot become pregnant.
- The hart in its third year; a young deer
- To divine; foretell