The most common and most likely answer to this crossword clue is the 7 letter word LOWLAND
I've seen this crossword clue in Financial Times
L
O
W
L
A
N
D
More clues leading to the result LOWLAND
Buddy explains!
The straight part
We know that "where there are no hills" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case where there are no hills = lowland.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 LOWLAND mean?
LOWLAND noun- Area which is lower than surrounding areas.