Moist, as a morning lawn (4)
I believe the answer is:
dewy
'moist as a morning lawn' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dewy that I've seen before include "wet grass" , "fresh in the morning?" , "Wet with condensation" , "laden with pearls" , "Fresh early on" .)