### Clue: Anger about record being overturned is marked (6)
### Answer: SPLEEN 
 ### Explanation: Definition: Anger
 **Reversal of**(… being overturned, in a down clue) LP(abbrev. for a "long-playing record"/a disc storing sound, to be played at 33? rpm) **contained in**(about … is) SEEN(marked/noted).