The most common and most likely answer to this crossword clue is the 8 letter word SPHEROID
I've seen this crossword clue in Financial Times
S
P
H
E
R
O
I
D
More clues leading to the result SPHEROID
- Building redo ship-shape
- Solid favourite relishes making a comeback on the outside
- Posh ride around the earth?
- Odds on 26 papers like the Globe
- Shifty pros hide ball that’s not completely round
- Upsetting depression’s overwhelming great man – one’s not perfectly rounded
- Special identification possessed by hero is shaped like a rugby ball. Quite the contrary
- Pros hide doctored ball
- Shape of shop, dire, unfortunately
Buddy explains!

The straight part
We know that "one’s not perfectly rounded" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one’s not perfectly rounded = spheroid.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 SPHEROID mean?
SPHEROID noun- A solid of revolution generated by rotating an ellipse about its major (prolate), or minor (oblate) axis.
- Of a shape similar to a squashed sphere.