Extremely popular breezy-sounding plain (7)
I believe the answer is:
prairie
'plain' is the definition.
(type of plain)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for prairie that I've seen before include "Continental grassland of N America" , "Open grassland of North America" , "this oyster produces an egg" , "Large tract of grassland in N America" , "Tract of (US) grassland" .)