The most common and most likely answer to this crossword clue is the 5 plus 8 letter word RIVER TERRACES
I've seen this crossword clue in The Daily Telegraph
R
I
V
E
R
T
E
R
R
A
C
E
S
Buddy explains!
The straight part
We know that "Rows after areas have dried up due to climate change" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rows after areas have dried up due to climate change = river terraces.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.