The most common and most likely answer to this crossword clue is the 4 letter word HAZE
I've seen this crossword clue in Financial Times
H
A
Z
E
More clues leading to the result HAZE
- Rag involving jigs by the sound of it?
- Film abuse in Hollywood
- Rag offering dances for audience?
- Tree not entirely visible in mist
- Mostly light brown dust in the air?
- Mist with tree not totally visible
- Mist in wood not beginning to lift
- Mist in west London area reported
- Scout hotel for golf film
- Mist somewhere in Middlesex, we hear
Buddy explains!

The straight part
We know that "mist" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mist = haze.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 HAZE mean?
HAZE noun- Very fine solid particles (smoke, dust) or liquid droplets (moisture) suspended in the air, slightly limiting visibility.
- A reduction of transparency of a clear gas or liquid.
- An analogous dullness on a surface that is ideally highly reflective or transparent.
- Any state suggestive of haze in the atmosphere, such as mental confusion or vagueness of memory.
- (packaging) The degree of cloudiness or turbidity in a clear glass or plastic, measured in percent.
- Any substance causing turbidity in beer or wine.
- To be or become hazy, or thick with haze.
- To perform an unpleasant initiation ritual upon a usually non-consenting individual, especially freshmen to a closed community such as a college or military unit.
- To oppress or harass by forcing to do hard and unnecessary work.
- In a rodeo, to assist the bulldogger by keeping (the steer) running in a straight line.