A horse charging violently causing characters to relocate (11)
I believe the answer is:
anagramming
'characters to relocate' is the definition.
I can't tell whether this defines the answer.
'a horse charging violently' is the wordplay.
'horse' becomes 'nag' (term for an old horse).
'charging violently' becomes 'ramming' (I can't explain this - if you can you should give a lot more credence to this answer).
'a'+'nag'+'ramming'='ANAGRAMMING'
'causing' is the link.
Can you help me to learn more?
(Another definition for anagramming that I've seen is " Making parts of strap, perhaps".)