Moist, naturally (4)
I believe the answer is:
dewy
'moist' is the definition.
(I've seen this in another clue)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for dewy that I've seen before include "Fresh early on" , "Wet with condensation" , "wet grass" , "laden with pearls" , "fresh in the morning?" .)