Crossword Genius

Firing left and right, say (8,6)

Ross

I believe the answer is:

marching orders

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

'firing left and right say' is the definition.
I can't tell whether this defines the answer.

'and right say' is the wordplay.
I cannot really understand how this works, but
'and' could be 'n' (common abbreviation for 'and') and 'n' is located in the answer.
'right' could be 'ar' (I've seen this in other clues) and 'ar' is found within the answer.
'say' could be 'order' (synonyms) and 'order' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

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

I've seen this clue in The Times and The Sunday Times.
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