Informer (5)
'informer' is the definition.
(grass can mean an informant)
This is the entire clue.
(Other definitions for grass that I've seen before include "Pasture" , "Might one tell" , "Lawn - informer" , "that often gets cut" , "Common plant" .)
'informer' is the definition.
(I know that Fink is a type of informer)
This is the entire clue.
(Another definition for fink that I've seen is " Informer (slang)".)
'informer' is the definition.
(I know that stoolpigeon is a type of informer)
This is the entire clue.