The most common and most likely answer to this crossword clue is the 7 letter word EURASIA
E
U
R
A
S
I
A
More clues leading to the result EURASIA
- Orwell’s state overturning first-rate appeal with regret
- I regret snatching it back, a huge area of land
- Court barred to actuaries working in large part of world
- Land mass area? US, I suspect
- Every other one blocked off, set up roads in an enormous area of land
- Here one is in US area? Wrong
- Set up a route regularly crossing one continent or two
- Huge area of mountains left deserted between Spain and the borders of India
- Germany and Japan are in it, USA and I are out
- Is a route across the Channel going north of a huge land mass?
Buddy explains!

The straight part
We know that "more than half the UN’s countries" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case more than half the un’s countries = eurasia.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.