A clause is a syntactic construction containing a subject and predicate and forming part of a sentence or constituting a whole simple sentence. eg . He bought the library which belongs to his uncle.
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JhumjhumPhrase is a group of words, which make sense, but not complete senseeg. Humpty Dumpty sat on a wallShow me how to do itGenerally, your definitions are OK, but "how to do it" is a subjectless subordinate clause, not a phrase, in your example.