The most common and most likely answer to this crossword clue is the 6 letter word GLOBES
I've seen this crossword clue in The Daily Telegraph
G
L
O
B
E
S
More clues leading to the result GLOBES
Buddy explains!
The straight part
We know that "they are rounded" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they are rounded = globes.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 GLOBES mean?
GLOBES noun- Any spherical (or nearly spherical) object.
- The planet Earth.
- A spherical model of Earth or any planet.
- A light bulb.
- A circular military formation used in Ancient Rome, corresponding to the modern infantry square.
- (chiefly in the plural) A woman's breast.
- A group.
- To become spherical.
- To make spherical.