Drops on a lawn (3)
I believe the answer is:
dew
'drops on a lawn' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dew that I've seen before include "Moisture condensed at night" , "The damp of early morning" , "Condensation at beginning or end of day" , "Night-time condensation" , "Condensation during the night" .)