The most common and most likely answer to this crossword clue is the 8 letter word MONOLITH
I've seen this crossword clue in The Daily Telegraph
M
O
N
O
L
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H
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 MONOLITH mean?
MONOLITH noun- A large, single block of stone which is a natural feature; or a block of stone or other similar material used in architecture and sculpture, especially one carved into a monument in ancient times.
- Anything massive, uniform, and unmovable, especially a towering and impersonal cultural, political, or social organization or structure.
- A substrate having many tiny channels that is cast as a single piece, which is used as a stationary phase for chromatography, as a catalytic surface, etc.
- A dead tree whose height and size have been reduced by breaking off or cutting its branches.
- To create (something) as, or convert (one or more things) into, a monolith.