Suggestion of school getting turned around (4)
I believe the answer is:
note
'suggestion' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for note that I've seen before include "Make a mental or written reminder" , "Observe; short letter" , "Short personal letter" , "Pay attention to, tone" , "Tone of distinction" .)