Shattered about me backing black mark (7)
I believe the answer is:
demerit
'black mark' is the definition.
(a black mark marks a demerit or fault)
'shattered about me backing' is the wordplay.
'shattered' becomes 'tired' (I can't explain this - if you can you should give a lot more credence to this answer).
'about' means one lot of letters goes inside another.
'backing' says the letters should be written backwards.
'tired' enclosing 'me' is 'tiremed'.
'tiremed' back-to-front is 'DEMERIT'.
Can you help me to learn more?
(Other definitions for demerit that I've seen before include "Fault, defect" , "Feature deserving censure" , "Mark given for a fault" , "Black mark" , "Conduct that deserves censure" .)