Final answer:
The adverb in the sentence is calmly. It modifies the verb clipped and describes how Sidney Crosby clipped the cheetah's nails.
Step-by-step explanation:
The adverb in the sentence is calmly.
An adverb is a word that modifies a verb, adjective, or other adverb. In this sentence, the adverb calmly modifies the verb 'clipped' and describes how Sidney Crosby clipped the cheetah's nails.
Example: She walked slowly. In this example, the adverb slowly modifies the verb 'walked' and describes how she walked.
Learn more about Adverbs