Sentence examples for a waiting from inspiring English sources

The phrase "a waiting" is not typically used in written English.
It is not grammatically correct as "waiting" is a verb and "a" is an article, which should be followed by a noun. You may see phrases like "waiting for" or "waiting on" in written English, but "a waiting" on its own is not a commonly used phrase. Example: "She sat in the doctor's office, a bundle of nerves, a waiting room full of other anxious patients."