See an order misread, mate! (7)
I believe the answer is:
comrade
'mate' is the definition.
(thesaurus)
'see an order misread' is the wordplay.
'see' becomes 'C' (the word for the letter, according to Chambers).
'an order' becomes 'om' (Order of Merit).
'misread' becomes 'rade' (I can't explain this - if you can you should give a lot more credence to this answer).
'c'+'om'+'rade'='COMRADE'
Can you help me to learn more?
(Other definitions for comrade that I've seen before include "Fellow-soldier" , "Companion" , "Colleague" , "Fellow soldier" , "Fellow member of the armed forces" .)