Perhaps Jean Brodie's disciples get the race fixed (13)
I believe the answer is:
schoolteacher
'perhaps jean brodie's' is the definition.
(character in The Prime of Miss Jean Brodie)
'disciples get the race fixed' is the wordplay.
'disciples' becomes 'school' (school can mean a group of like-minded people).
'get' means one lot of letters go next to another.
'fixed' is an anagram indicator.
'the'+'race'='therace'
'therace' is an anagram of 'teacher'.
'school'+'teacher'='SCHOOLTEACHER'
(Other definitions for schoolteacher that I've seen before include "Master, say" , "who has class?" , "tutor" , "Chips perhaps" , "Instructor" .)