Spur incorporated it by end of shoe (6)
I believe the answer is:
incite
'spur' is the definition.
(I've seen this in another clue)
'incorporated it by end of shoe' is the wordplay.
'incorporated' becomes 'inc'.
'by' is a charade indicator (letters next to each other).
'end of' indicates one should take the final letters.
The final letter of 'shoe' is 'e'.
'inc'+'it'+'e'='INCITE'
(Other definitions for incite that I've seen before include "Encourage (to violence)" , "Urge (to violence)" , "Start" , "Arouse to action" , "Whip up" .)