Order grade to be changed, getting C for German (6)
I believe the answer is:
decree
'order' is the definition.
(synonyms)
'grade to be changed getting c for german' is the wordplay.
I cannot quite see how this works, but
'getting' could be 're' (I've seen this in other clues) and 're' is found within the answer.
'c' is present in the answer.
'german' could be 'd' and 'd' is present in the answer.
The remaining letters 'ee' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for decree that I've seen before include "Ordinance" , "An official order or judgement" , "Rule" , "Judgment of a court" , "Formal order or ruling" .)