Nations liaised about way of getting more drinking water (14)

I believe the answer is:

desalinisation

I'm a little stuck... Click here to teach me more about this clue!

'way of getting more drinking water' is the definition.
I can't tell whether this defines the answer.

'nations liaised about' is the wordplay.
'about' indicates an anagram.
'nations'+'liaised'='nationsliaised'
'nationsliaised' is an anagram of 'DESALINISATION'.

Can you help me to learn more?

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app