When one gets a lot of terrain (4)
I believe the answer is:
asia
'lot of terrain' is the definition.
The answer and definition can be both locations as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'when one gets a' is the wordplay.
'when' becomes 'as' (eg 'when I walked' means 'as I walked').
'one' becomes 'i' (Roman numeral).
'gets' says to put letters next to each other.
'as'+'i'+'a'='ASIA'
Can you help me to learn more?
(Other definitions for asia that I've seen before include "The nations of the East, collectively" , "Populous area" , "A vast number of people have lived here" , "Populous continent" , "its pampered jades couldn't draw much?" .)