The most common and most likely answer to this crossword clue is the 7 letter word NIAGARA
I've seen this crossword clue in The Daily Telegraph
N
I
A
G
A
R
A
More clues leading to the result NIAGARA
- Win over artist capturing a N American river
- A newspaper article, in rising, falls
- River's northern one a gelatinous substance blocks
- Falls here again, backing the Gunners
- Returning once more, artist falls
- A king, once more climbing, falls here
- Falls back again with gunners
- Return once more with artist to where river is falling
- River, northern one, a gelatinous substance blocks
- Falls back once more having run ahead to start with
Buddy explains!

The straight part
We know that "Falls" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case falls = niagara.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.