Pure water deserves due mention (3)

I believe the answer is:

dew

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'pure water deserves' is the definition.
I can't tell whether this defines the answer.

'due mention' is the wordplay.
'mention' shows a homophone (sound like) (I've seen 'mentioned' mean this).
'due' sounds like 'DEW'.

Can you help me to learn more?

(Other definitions for dew that I've seen before include "Early morning condensation" , "Early freshness" , "Moisture on ground" , "Condensation during the night" , "Overnight condensation" .)

I've seen this clue in the Evening Standard.

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