Racing sods (4)
I believe the answer is:
turf
'racing' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for turf that I've seen before include "Grass clod" , "Horse racing, generally" , "Cover over with grass" , "Piece of lawn" , "Divot" .)