To scatter seed around the 1st of November is stupid (5)
I believe the answer is:
dense
'stupid' is the definition.
(similar in meaning)
'to scatter seed around the 1st of november' is the wordplay.
'to scatter' is an anagram indicator.
'around' is an insertion indicator.
'the 1st of november' becomes 'n' (1st letter of 'november').
'seed' is an anagram of 'dese'.
'dese' going around 'n' is 'DENSE'.
'is' is the link.
(Other definitions for dense that I've seen before include "Solid, thick" , "Close-packed" , "Closely packed" , "Closely compacted" , "Slow-witted" .)