1) Arthur miller protagonist 2) Arthur Miller subject 3) Car dealer 4) Corporate road warrior 5) Drummer 6) Drummer or pitcher 7) End of a Miller title 8) Frequent traveler 9) Guy earning commissions 10) Guy hawking 11) Guy on commission 12) Infomercial figure 13) Loman 14) Loman, famously 15) Male vendor Found on https://www.crosswordclues.com/clue/salesman
(from the article `agency`) ...limited are the powers of the real estate agent, who may show the land and state the asking price to the potential buyer without ordinarily being ... Found on http://www.britannica.com/eb/a-z/s/14
Sales'man (sālz'm a n) noun ; plural Salesmen (-m e n). [ Sale + man .] One who sells anything; one whose occupation is to sell goods or merchandise. Found on http://www.encyclo.co.uk/webster/S/7