### Clue: Step in when Bury against Everton ends ultimately in violence (9)
### Answer: INTERVENE 
 ### Explanation: Definition: Step in
 INTER(to bury, say, a corpse) + V(abbrev. for "versus"/against, as with one competitive team against another) + **1st and last letters of**(… ends) "Everton" + **last letter of**(ultimately in) "violence".