Parade for review now a new month has begun? (5,4)
I believe the answer is:
march past
'parade' is the definition.
(type of military parade)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for march past that I've seen before include "Parade before a saluting base" , "Military parade" , "Movement of a body of soldiers being reviewed" , "Companion" , "ceremonial parade" .)