Because, I don't think there is any synonyms in that sentence for that word or anything that gives you a hint about the unknown word meaning, but, if I would make a guess I would say that the following sentence, "No one else had been clever enough to figure it out" would say something about the 'unknown meaning' word. However, usually if I see a word that I can't find its meaning in the following sentence, I would just look up its meaning or find synonyms of that word.
A group of words that includes a subject and a verb but does not express a complete thought is called subordinate clause, or also referred to as dependent clause. This group of words is not a sentence and can't stand alone as a sentence. Example : Because I can't wait for the bus; Until the sun rises.
<span>"I remember when my cousin and I would play at the park everyday. It was as if the park was our home. We felt more at home at the park than at home. Home life was rough like sandpaper for us."</span>