Not all the water in the wide world (3)

I believe the answer is:

dew

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'not all the water' is the definition.
I can't tell whether this defines the answer.

'in the wide world' is the wordplay.
'in' says the answer is hidden in the clue.
'DEW' can be found hidden inside 'wide world'.

Can you help me to learn more?

(Other definitions for dew that I've seen before include "Condensation at beginning or end of day" , "Moisture on grass" , "Moisture condensed at night" , "Early morning condensation" , "Night-time moisture" .)

I've seen this clue in the Evening Standard.

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