The most common and most likely answer to this crossword clue is the 3 letter word LEY
I've seen this crossword clue in The Daily Telegraph
L
E
Y
More clues leading to the result LEY
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 LEY mean?
LEY noun- An open field, meadow.
- A ley line.
- Fallow; unseeded.
- Rotated to pasture instead of cropping.
- An alkaline liquid made by leaching ashes (usually wood ashes).
- Potassium or sodium hydroxide (caustic soda).
- A short side line, connected with the main line; a turn-out; a siding.
- Law.