Plan from school, English, supported by this compiler (6)
I believe the answer is:
scheme
'plan' is the definition.
(I know that scheme is a more specific form of the action plot)
'school english supported by this compiler' is the wordplay.
'school' becomes 'sch' (abbreviation).
'english' becomes 'E' (abbreviation).
'supported by' is a charade indicator (letters next to each other) (in a down clue, some letters hold up others).
'this compiler' becomes 'me' (the person who is writing these clues).
'sch'+'e'+'me'='SCHEME'
'from' acts as a link.
(Other definitions for scheme that I've seen before include "System or strategy" , "'Plot, plan (6)'" , "proposal" , "Secret plan, plot" , "Plot, plan secretly" .)