Senior teacher erased math problem (10)
I believe the answer is:
headmaster
'senior teacher' is the definition.
(teacher in charge of a school)
'erased math problem' is the wordplay.
'problem' indicates an anagram.
'erased'+'math'='erasedmath'
'erasedmath' is an anagram of 'HEADMASTER'.
(Other definitions for headmaster that I've seen before include "Principal" , "School manager" , "Top (male) teacher" .)