The most common and most likely answer to this crossword clue is the 8 letter word BASEMENT
I've seen this crossword clue in The Guardian
B
A
S
E
M
E
N
T
More clues leading to the result BASEMENT
- Criminal covers same ground in cellar
- Mean chaps beginning to trash garden flat?
- Ten beams must be replaced for lowest floor
- Soldiers in HQ head to the sub- ground level
- Mammal hiding seed in underground space
- Wretched fellows heading for torture in cellar
- Tendency to cover same ground in cellar
- Criminal hiding, when I turned up, in cellar
- New front put on window frame in lower storey
- Bet name’s changed for underground site
Buddy explains!

The straight part
We know that "cellar" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cellar = basement.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 BASEMENT mean?
BASEMENT noun- A floor of a building below ground level.
- A mass of igneous or metamorphic rock forming the foundation over which a platform of sedimentary rocks is laid.
- Last place in a sports conference standings.