Which preposition to use with clubmen

in Occurrences 2%

He was to be introduced to the magnates of the dramatic profession, to become a clubman in the world's most hospitable city, to mix freely in the circles where he would find himself in constant association with the keenest brains and most brilliant men of letters in the world.

at Occurrences 1%

One takes some dirty, horrible incident or sight of the battle-front and describes it in loathsome detail, and then, by way of contrast, describes some fat and incredibly bloodthirsty woman or middle-aged clubman at home, gloating over the glorious war.

Which preposition to use with  clubmen