Bore old President (6)
I believe the answer is:
pierce
This clue is a double definition.
'bore' is the first definition.
(thesaurus)
'old president' is the second definition.
(I know that Pierce is no longer in existence)
(Other definitions for pierce that I've seen before include "Prick" , "Penetrate with a sharp instrument" , "Puncture or penetrate" , "Cavalry sword" , "Penetrate with sharp point" .)