The most common and most likely answer to this crossword clue is the 6 letter word RHOMBI
I've seen this crossword clue in Financial Times
R
H
O
M
B
I
More clues leading to the result RHOMBI
- Rob him criminally for diamonds {6)
- Geometrical figures transforming hob rim
- Letter from Greek doctor and I showing figures found on 14
- Shapes head of hair into semi-Afro mass going both ways
- Rob him violently getting diamonds
- Spanish chap’s not about to invest in Queen Victoria’s style diamonds
- Shapes resistance to Homi's BARC initiative
- Character in Sophocles married sexually open-minded figures
- Plane figures in Spooner’s order to attack East Sussex town
Buddy explains!
The straight part
We know that "Plane figures" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case plane figures = rhombi.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 RHOMBI mean?
RHOMBI noun- A parallelogram having all sides of equal length.
- In early Greek religion, an instrument whirled on the end of a string similar to a bullroarer.
- Any of several flatfishes, including the brill and turbot, once considered part of the genus Rhombus, now in Scophthalmus.
- Snails, now in genus Conus or family Conidae.