The most common and most likely answer to this crossword clue is the 8 letter word NUMERALS
I've seen this crossword clue in Financial Times
N
U
M
E
R
A
L
S
More clues leading to the result NUMERALS
Buddy explains!

The straight part
We know that "Could be ten and more" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case could be ten and more = numerals.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 NUMERALS mean?
NUMERALS noun- A symbol that is not a word and represents a number, such as the Arabic numerals 1, 2, 3 and the Roman numerals I, V, X, L.
- A word representing a number.
- A card whose rank is a number (usually including the ace as 1).