Crossword Genius

What they're seeing is even less moisture (5)


I believe the answer is:


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'less moisture' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'what they're seeing is even' is the wordplay.
'seeing is even' means one should take alternating letters (even-numbered letters are used).
The alternate letters of 'whattheyre' are 'WATER'.

Can you help me to learn more?

(Other definitions for water that I've seen before include "Give fluid to (plants)" , "Aqua" , "Inundate" , "Drink - type of 1 across" , "One of the four classical elements" .)

I've seen this clue in the Sydney Morning Herald.
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