Sailed around country that can provide drinking water (12)

I believe the answer is:

desalination

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'can provide drinking water' is the definition.
I can't tell whether this definition defines the answer.

'sailed around country' is the wordplay.
'around' indicates anagramming the letters.
'country' becomes 'nation' (synonyms).
'sailed' is an anagram of 'desali'.
'desali'+'nation'='DESALINATION'

'that' acts as a link.

Can you help me to learn more?

(Another definition for desalination that I've seen is " Activity of water company".)

I've seen this clue in The Irish Times.

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