Put a skewer through one’s pasty (6)
I believe the answer is:
impale
'put a skewer' is the definition.
(impale with a skewer)
'one's pasty' is the wordplay.
'one's' becomes 'I'm' ('one is' is a formal way of saying 'I am').
'pasty' becomes 'pale' (synonyms).
'im'+'pale'='IMPALE'
'through' is the link.
(Other definitions for impale that I've seen before include "go through with it" , "transfix with sharp item" , "Puncture" , "Pierce, run through" , "Pierce with a stick (as Vlad did?)" .)