Sentence:  The "[Washington] Post's" <WSD>proprietor</WSD> through those turbulent [Watergate] days, Katharine Graham, held a double place in Washington's hierarchy: at once regal Georgetown hostess and scrappy newshound, ready to hold the establishment to account. That is a very American position. British journalists shun complete respectability, feeling a duty to be ready to savage the mighty, or rummage through their bins. 
Meaning of the word marked with <WSD> tags:  An owner.