Thick scattering of seed around the end of the garden (5)
I believe the answer is:
dense
'thick' is the definition.
(I know that thick can be written as dense)
'scattering of seed around the end of the garden' is the wordplay.
'scattering of' indicates an anagram (I've seen this in other clues).
'around' means one lot of letters goes inside another.
'the end of the' indicates one should take the final letters.
The final letter of 'garden' is 'n'.
'seed' is an anagram of 'dese'.
'dese' going around 'n' is 'DENSE'.
(Other definitions for dense that I've seen before include "Needs (anag) -- thick" , "Maybe bovine" , "Closely crowded together" , "Close-knit" , "Closely spaced or extremely stupid" .)