The correct answer is False
Explanation:
In grammar, a linking verb is a type of verb that does not express an action but connects the subject to the complement to describe it or explaining, this includes verbs such as "be", "seem" or look. On the other hand, an adverbial clause refers to a set of words that modifies or describes how something is, which means it works as an adverb that describes the mode, frequency, place, timer or degree in which action takes places. This type of clause is useful for describing how something occurs, especially an action. But not to describe how something is or looks, which is the purpose of a definition. Also, adverbial phrases are not usually placed after linking verbs because these verbs do not express action and therefore an adverb cannot be used.
Considering this, it can be concluded placing an adverb clause after a linking verb is not a good way to start a definition, not only because adverbs are not commonly placed after this type of verbs, but because adverbs clauses show how something occurs but not the way something is, which is the information you need to place first on a definition.
