The most common and most likely answer to this crossword clue is the 10 letter word DESALINATE
I've seen this crossword clue in Financial Times
D
E
S
A
L
I
N
A
T
E
More clues leading to the result DESALINATE
Buddy explains!
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 DESALINATE mean?
DESALINATE verb- To remove the salt from something, especially from seawater for use in a domestic water supply