Cryptic crossword clue
Principal’s ways of speaking to convey grave things 10

The most common and most likely answer to this crossword clue is the 10 letter word HEADSTONES

I've seen this crossword clue in The Daily Telegraph
H
E
A
D
S
T
O
N
E
S

Buddy explains!

The straight part
We know that "grave things" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case grave things = headstones.
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 HEADSTONES mean?

HEADSTONES noun
  1. A gravestone, a grave marker: a monument traditionally made of stone placed at the head of a grave.
  2. The cornerstone or principal stone of a building.

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