The most common and most likely answer to this crossword clue is the 3 letter word ENT
E
N
T
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 ENT mean?
ENT noun- A fictional, large, humanoid, mobile talking tree in works by J. R. R. Tolkien.
- To empty or pour.