Harry and educationist reside northwards (7)
I believe the answer is:
bedevil
'harry' is the definition.
(I know that bedevil is a more specific form of the action harry)
'educationist reside northwards' is the wordplay.
'educationist' becomes 'bed' (someone with a Bachelor of Education degree).
'reside' becomes 'live' (synonyms).
'northwards' is a reversal indicator (in a down clue, letters go up or 'north').
'live' written backwards gives 'evil'.
'bed'+'evil'='BEDEVIL'
'and' acts as a link.
(Other definitions for bedevil that I've seen before include "Cause problems for" , "torment" , "Dog" , "Cause difficulties for, like Satan?" , "Cause continual difficulties" .)