perhaps if its not too big its worth getting someone to save it and take it when its dorement . if not get someone to get it cut at the base .

Cut it all down to the base, leaving woody parts just sticking up from the soil. Drill or cut into the woody parts and apply SBK, neat, a brushwood killer - but don't spill it on the soil around and about. Cover with something (upturned pots, slabs, whatever) and leave.