Figures they're all round (7)
I believe the answer is:
spheres
'figures' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Maybe you can see a link between them that I can't see?
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for spheres that I've seen before include "Globes" , "balls" , "Areas" .)