Oddly enough, my company had an incident only 3 days ago where we were forced to go-around from very low level after another companys' aircraft entered the runway without permission. Upon reading the Air Safety Report it appears that the ATC phraseology was ambiguous which led to the incursion in the first place, which I think demonstrates the point of the post...
(The phraseology used was xxx123, taxy to RWY xx via intersection xx, with no mention made of "hold short")