Prepare the ground round the back of the meadow for this material (5)
I believe the answer is:
twill
'this material' is the definition.
(twill is a kind of material)
'prepare the ground round the back of the meadow' is the wordplay.
'prepare the ground' becomes 'till' (to till is to prepare land for farming).
'round' is an insertion indicator.
'the back of the' indicates one should take the final letters.
The last letter of 'meadow' is 'w'.
'till' placed around 'w' is 'TWILL'.
'for' acts as a link.
(Other definitions for twill that I've seen before include "Ribbed cloth" , "Strong ridged fabric" , "Cloth with diagonal ribs" , "Diagonal-weave fabric" , "Stuff" .)