Wiktionary
adv. (context informal English) (non-gloss definition: After a numeral, denotes a time of around the start of that hour.)
Usage examples of "o'clockish".
Modesty and a sense of literary decorum forbids me from relating the rest of the scene, except to say that after she couldn't find no wounds on me I started pointing out where they were on her so she would have a firmer grasp of the situation, and pretty soon we were grasping each other so firmly that both of us plumb forgot about my wounds, and we might have stayed like that forever except that about four in the morning I woke up and started feeling kind of eleven o'clockish a good seven hours early, so I climbed back into my clothes and moseyed on down to the kitchen to see if I could scare up a little snack, and ran smack-dab into General Gruenwald and Lord Mayor Rembert, who were there sipping glasses of brandy.
That did seem like a lot of tea, no matter how eleven o'clockish Clyde might feel, so I got to thinking, and it didn't take me long to figure out that someone was swiping our supplies.