Odd regions of Neptune, Venus (6)

I believe the answer is:

uneven

I'm a little stuck... Click here to teach me more about this clue!

'odd' is the definition.
(I've seen this before)

'of neptune venus' is the wordplay.
'of' says the answer is hidden in the clue.
'UNEVEN' is hidden within 'neptune venus'.

'regions' is the link.
I am not very happy about this link. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for uneven that I've seen before include "Inconsistent in quality or shape" , "Odd - rough" , "Not smooth or flat" , "That's odd" , "Rugged" .)

I've seen this clue in the Sydney Morning Herald.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.