The most common and most likely answer to this crossword clue is the 8 plus 5 letter word VICTORIA FALLS
I've seen this crossword clue in The Daily Telegraph
V
I
C
T
O
R
I
A
F
A
L
L
S
More clues leading to the result VICTORIA FALLS
- Frail vocalist surprisingly displaying great force abroad
- Thunderous African spectacle? Call for a visit to be arranged
- Big splash as sovereign dethroned?
- Big splash in Africa, possible headline after royal stumble?
- Girl declines to see African landmark
- Girl comes a cropper somewhere in Zambia
- Former queen stumbles at this waterbody
Buddy explains!
The straight part
We know that "African landmark" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case african landmark = victoria falls.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.