The most common and most likely answer to this crossword clue is the 4 letter word ZEAL
I've seen this crossword clue in The Times
Z
E
A
L
More clues leading to the result ZEAL
- Enthusiasm of Zoe, early regularly
- Ardour shown during craze, a lot
- Diligence essential to NZ’s expansion
- Fire fanatic for censoring books
- Laze around, showing enthusiasm
- What’s less than blaze, a little fire
- In Belize, a lover showing passion
- Laze around to show this? Yes and no!
- Laze around, wanting enthusiasm?
- Final character before negotiation losing head in enthusiasm
Buddy explains!

The straight part
We know that "Enthusiasm" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case enthusiasm = zeal.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 ZEAL mean?
ZEAL noun- The fervour or tireless devotion for a person, cause, or ideal and determination in its furtherance; diligent enthusiasm; powerful interest.
- A person who exhibits such fervour or tireless devotion.
- The collective noun for a group of zebras.