Type of lawn grass (4)
I believe the answer is:
bent
'type of lawn grass' is the definition.
(I know that bent is a type of grass)
This is the entire clue.
(Other definitions for bent that I've seen before include "Dishonest; curved" , "Slang for dishonest or crooked" , "Special skill" , "Sharply curved, grass" , "Morally crooked" .)