The most common and most likely answer to this crossword clue is the 10 letter word POLYHEDRON
I've seen this crossword clue in The Guardian
P
O
L
Y
H
E
D
R
O
N
Buddy explains!

The straight part
We know that "that’s /more than two-faced" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case that’s /more than two-faced = polyhedron.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 POLYHEDRON mean?
POLYHEDRON noun- A solid figure with many flat faces and straight edges.
- A polyscope, or multiplying glass.