The most common and most likely answer to this crossword clue is the 4 letter word GREY
I've seen this crossword clue in The Guardian
G
R
E
Y
More clues leading to the result GREY
- Prime minister’s dismal horse
- What’s the matter with intelligence? Poet’s pronouncement
- Cases of Gewürztraminer, exceptionally pale
- & 27 Province following the PM? Not too clear, that
- See 14 Down
- Neutral colour reflected in perfectly ergonomic surroundings
- Dull player gets partial backing
- Agree, without borders, yard is dull
- Potty Earl?
- Obscene king anticipates piece of cake
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 GREY mean?
GREY adjective- Having a color.
- Having a particular color or kind of color.
- Having prominent colors; colorful.
- Influenced pervasively but subtly.
- Of skin color other than white; in particular, black.
- Of neither black nor white skin color.
- Designated for use by colored people (in either the US or South African sense).
- An achromatic colour intermediate between black and white.
- An animal or thing of grey colour, such as a horse, badger, or salmon.
- An extraterrestrial humanoid with greyish skin, bulbous black eyes, and an enlarged head.
- To become grey.
- To cause to become grey.
- To turn progressively older, in the context of the population of a geographic region.
- To give a soft effect to (a photograph) by covering the negative while printing with a ground-glass plate.
- Having a color somewhere between white and black, as the ash of an ember.
- Dreary, gloomy.
- Having an indistinct, disputed or uncertain quality.
- Relating to older people.