### Clue: Unruly troll chose to embrace energy level many would seek to lower (11)
### Answer: CHOLESTEROL 
 ### Explanation: Definition: level many would seek to lower
 **Anagram of**(Unruly) TROLL CHOSE **containing**(to embrace) E(symbol for "energy", in phyics).
Defn: …, but only the level of the bad form of the substance.