Rain lightly (7)
(Other definitions for drizzle that I've seen before include "Thin rain" , "Fine rain" , "Very light rain, stronger than mist but less than a shower" , "Rain gently" , "Shed in fine drops" .)
'rain lightly' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sprinkle that I've seen before include "Splash" , "Spatter liquid around" , "Scatter in tiny particles" , "Scatter, pour in drops" , "Some 8s [RAINDROP]" .)