Regularly bans visas for approximately 60% of the world’s population (4)
I believe the answer is:
asia
'approximately 60% of the world's population' is the definition.
I can't tell whether this definition defines the answer.
'regularly bans visas' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'bans'+'visas'='bansvisas'
The alternate letters of 'bansvisas' are 'ASIA'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for asia that I've seen before include "Major land mass" , "Thailand and its location" , "Populous continent" , "huge region" , "Tigers found here" .)