Run through one's barrier (6)
I believe the answer is:
impale
'run through' is the definition.
(I've seen this before)
'one's barrier' is the wordplay.
'one's' becomes 'im' ('one is' is a formal way of saying 'I am').
'barrier' becomes 'pale' (I can't justify this - if you can you should give a lot more credence to this answer).
'im'+'pale'='IMPALE'
Can you help me to learn more?
(Other definitions for impale that I've seen before include "Spike" , "Fix as on a sharp stick" , "shut in as before" , "Kill by piercing with a spear or sharp pole" , "Pierce with pointed stick" .)