The most common and most likely answer to this crossword clue is the 8 letter word OVERCAST
I've seen this crossword clue in The Guardian
O
V
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C
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More clues leading to the result OVERCAST
- Gloomy about group of actors
- Gloomy director's position in theatre?
- Dull players must have finished in front
- Finished shed in grey
- Finished with model? That’s a bit dim!
- Gloomy about company
- It’s about actors being dull
- Not very bright, so extra shy
- Lover castigated about being dull
- Accomplished players seen as dull
Buddy explains!

The straight part
We know that "grey" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case grey = overcast.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 OVERCAST mean?
OVERCAST noun- An outcast.
- A cloud covering all of the sky from horizon to horizon; cloudy.
- To overthrow.
- To cover with cloud; to overshadow; to darken.
- To make gloomy; to depress.
- To be or become cloudy.
- To transform.
- To fasten (sheets) by overcast stitching or by folding one edge over another.
- Covered with clouds; overshadowed; darkened; more than 90% covered by clouds.
- In a state of depression; gloomy; melancholy.