Answer :
Yes, the phrase "on an otherwise unremarkable September morning" is indeed a clause. Specifically, it's an adverbial clause that provides additional information about the timing or circumstances of the main action in a sentence. In this case, it sets the scene or context for an event that occurred on that September morning, adding detail and depth to the sentence.
Adverbial clauses typically answer questions like "when," "where," "why," "how," or "under what conditions" and function to modify verbs, adjectives, or adverbs in a sentence. In your example, it modifies the action that happened on that particular morning, specifying that it was "otherwise unremarkable," implying that there was something noteworthy or exceptional about the event in contrast to the ordinary nature of the morning.
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