The most common and most likely answer to this crossword clue is the 6 letter word DENARY
I've seen this crossword clue in The Times
D
E
N
A
R
Y
Buddy explains!
The straight part
We know that "of ten" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case of ten = denary.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 DENARY mean?
DENARY noun- An ancient coin, the denarius.
- Containing ten parts.
- Based on the number ten.