He did his duty as part host like a man of the world.

[Nonverbis]

"On Sundays they had a good many people down for the day, actors and actresses, an occasional writer, and a sprinkling of some of their grander friends. Julia found these parties very amusing and she knew that people liked to come to them. On the first Sunday after Roger's arrival there was a great mob. Roger was very polite to the guests. He did his duty as part host like a man of the world. But it seemed to Julia that he held himself in some curious way aloof, as though he were playing a part in which he had not lost himself, and she had an uneasy feeling that he was not accepting all these people, but coolly judging them. She had an impression that he took none of them very seriously."

Source: Theatre by Somerset Maugham

Could you help me understand what "part host" mean? Maybe a typo? A party host? That is an articleand the flexion are missing.

 

[teechar]

Maybe a typo? A party host?

Yes, that's right.