Cryptic crossword clue
Purification process that could be organised by Ionian Sea Ltd? 12

The most common and most likely answer to this crossword clue is the 12 letter word DESALINATION

I've seen this crossword clue in The Daily Telegraph
D
E
S
A
L
I
N
A
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I
O
N

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The cryptic/wordplay part
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This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
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What does DESALINATION mean?

DESALINATION noun
  1. The process of removing salt from sea water in order to make drinking water.

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