A metaphor is a device that gives a description of a thing or an action in a way that is not actually true, but makes it easier to develop an idea or compare two elements. According to this definition, in this case, the metaphor indicates that "the clues" are a "road map", in order to symbolize what the clues symbolize to the speaker.
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Identify the mood in the following sentences: Shelly lightly skipped across the playground and found the brightest yellow flower; her smile beamed with glee.