Rule broken by halfwit put in new position (8)
I believe the answer is:
reassign
'put in new position' is the definition.
(I've seen this before)
'rule broken by halfwit' is the wordplay.
'rule' becomes 'reign' (reigning is a kind of ruling).
'broken by' means one lot of letters goes inside another (inserted letters break into the word).
'halfwit' becomes 'ass' (I've seen this in another clue).
'reign' enclosing 'ass' is 'REASSIGN'.
(Other definitions for reassign that I've seen before include "Give out afresh" , "Allocate again" , "put in new position" , "Again appoint" , "Give a new job" .)