We have no meanings for "come a knocking" in our records yet.
1 There came a knocking at the door, and the servant disappeared.
2 Later on there comes a knocking at the door, an impatient rapping, really.
3 A little before sunset there came a knocking at the house-door.
4 Half an hour later there came a knocking at the door.
5 Now, as they were talking, behold, there came a knocking at the door.
6 As the bell sounded the hour, there came a knocking at the street door.
7 Then came a knocking on the window of the carriage.
8 At that moment there came a knocking at the door.
9 At this moment there came a knocking on the door.
10 After a time, there came a knocking on my door.
11 There came a knocking , a rapping, at my chamber door.
12 A moment of silence, and again came a knocking - knocking - knocking
13 Here there came a knocking at the front door.
14 Then came a knocking upon his door, and he did not notice it at once.
15 But presently there came a knocking on the door!
16 At last came a knocking , knocking at the door-tap!
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