Crossword Genius

Notice month in good grades (8,6)

Ross

I believe the answer is:

marching orders

I'm a little stuck... Click here to teach me more about this clue!

'notice' is the definition.
(I know that marching orders is a type of dismissal)

'month in good grades' is the wordplay.
'month in good' becomes 'marching' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'grades' becomes 'orders' ('order' can be a synonym of 'grade').
'marching'+'orders'='MARCHING ORDERS'

Can you help me to learn more?

(Other definitions for marching orders that I've seen before include "may be issued on the parade ground" , "Notice" , "what's given to departing soldiers?" , "They send you packing" , "given when firing?" .)

I've seen this clue in the Sydney Morning Herald.
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