Force string instrument over fence forcelessly (8)
I believe the answer is:
violence
'force' is the definition.
(force can mean violence or aggression)
'string instrument over fence forcelessly' is the wordplay.
I cannot quite see how this works, but
'string' could be 'viol' (viol is a kind of string) and 'viol' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for violence that I've seen before include "Destructive force" , "Unjustifiable force" , "Excessive use of force" , "Aggro" , "Act of aggression, physical force" .)