Landscaping material (3)
I believe the answer is:
sod
'landscaping material' 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 peat or grass" , "Lump of earth" , "Surface layer of ground with grass roots" , "A piece of sward." , "Piece of turf; a Law named for him" .)