Biden, for one, raising flag, getting black mark (7)
I believe the answer is:
demerit
'black mark' is the definition.
(a black mark marks a demerit or fault)
'biden for one raising flag' is the wordplay.
'biden for' becomes 'dem' (I can't justify this - if you can you should give a lot more credence to this answer).
'one raising' is a reversal indicator.
'flag' becomes 'tire' (I've seen this in other clues).
'tire' in reverse letter order is 'erit'.
'dem'+'erit'='DEMERIT'
'getting' acts as a link.
Can you help me to learn more?
(Other definitions for demerit that I've seen before include "Conduct that deserves censure" , "Fact deserving censure" , "Something deserving censure" , "Black mark" , "Mark given for a fault" .)