The most common and most likely answer to this crossword clue is the 9 letter word OCTAHEDRA
I've seen this crossword clue in The Guardian
O
C
T
A
H
E
D
R
A
Buddy explains!

The straight part
We know that "figures" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case figures = octahedra.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 OCTAHEDRA mean?
OCTAHEDRA noun- A polyhedron with eight faces; the regular octahedron has regular triangles as faces and is one of the Platonic solids.