The most common and most likely answer to this crossword clue is the 7 letter word PRAIRIE
P
R
A
I
R
I
E
More clues leading to the result PRAIRIE
- Presentation of image less stuffy — almost plain
- Plain attitude that is supporting promotional work
- Public relations broadcast that is plain
- Plain expression that is concluding publicity
- Plain couple crossing river “discovered” pier
- Publicity broadcast that is plain
- Plain song? Probed endlessly about that
- Broadcast that is going after voting system — that’s plain
- . Grassland in Peru regularly windy we hear
- Is inquisitive mostly about attitude in central American region?
Buddy explains!

The straight part
We know that "grassy plain" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case grassy plain = prairie.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.
What does PRAIRIE mean?
PRAIRIE noun- An extensive area of relatively flat grassland with few, if any, trees, especially in North America.