The most common and most likely answer to this crossword clue is the 8 letter word HEPTAGON
I've seen this crossword clue in The Sunday Telegraph
H
E
P
T
A
G
O
N
Buddy explains!

The straight part
We know that "Figure" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case figure = heptagon.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 HEPTAGON mean?
HEPTAGON noun- A polygon with seven sides and seven angles.