Hurry to get hold of revolutionary educationist (7)
I believe the answer is:
teacher
'educationist' is the definition.
(thesaurus)
'hurry to get hold of revolutionary' is the wordplay.
'hurry' becomes 'tear' (tear is a kind of hurry**).
'to get hold of' indicates putting letters inside.
'revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary).
'tear' going around 'che' is 'TEACHER'.
(Other definitions for teacher that I've seen before include "The trainer" , "School educator" , "Schoolmaster" , "Master" , "Chips, perhaps?" .)