Hoskins is dim prick all the way through! (6)
I believe the answer is:
impale
'prick all the way through' is the definition.
I can't tell whether this defines the answer.
'hoskins is dim' is the wordplay.
'hoskins is' becomes 'I'm' (where the crossword setter is 'Hoskins').
'dim' becomes 'pale' (I've seen this in another clue).
'im'+'pale'='IMPALE'
Can you help me to learn more?
(Other definitions for impale that I've seen before include "kebab" , "Skewer" , "Kill by piercing with a spear or sharp pole" , "Spike" , "Puncture" .)