Greenskeeper's roll (3)
I believe the answer is:
sod
'greenskeeper's roll' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sod that I've seen before include "Piece of turf; a Law named for him" , "A lulmp of turf" , "Piece of peat or grass" , "Lump of turf or unpleasant person" , "Lump of earth" .)