Unvariegated lowland? (5)
I believe the answer is:
plain
This could be a double definition.
'unvariegated' is the first definition.
'lowland?' is the second definition.
The definition and answer can be both natural objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for plain that I've seen before include "Undecorated; clear" , "lacking special beauty" , "Unadorned; evident" , "Not decorated" , "Simple, unadorned" .)