The world of surreal nouns, oddly overlooked (6)
I believe the answer is:
uranus
'the world' is the definition.
('world' could refer to any planet)
'surreal nouns oddly overlooked' is the wordplay.
'oddly overlooked' indicates alternate letters (letters in odd-numbered positions removed).
'surreal'+'nouns'='surrealnouns'
The alternating letters of 'surrealnouns' are 'URANUS'.
'of' acts as a link.
(Other definitions for uranus that I've seen before include "A major planet or the most ancient Greek god" , "Most ancient of Greek gods, and a major planet" , "Planet of solar system" , "Might USA run up the planet?" , "Holst's Magician planet" .)