Hello Soup,
Yes,it helps of course,thank you.Please let me give some more observations on this,I hope I'm not boring too much.
In the sentence "Where did you get to?" you've elaborate the case with "where" as an interrogative pronoun,but I would like to know about "where" as a relative pronoun.I'll take one sentence with subordinated relative clause(clause which postmodify a noun phrase):
Macy's is the place
where I buy my clothes.
I would say that "where" here is by its form a relative adverb= subclass of adverbs which serves adittional role of a subordinator.That is,it is functionaly adverbial in the relative clause(I buy my clothes "where") and additionaly connects two clauses into one sentence.
If I remove "the place" from previous sentence I get a type of sentence which Quirk classifies as a subclass of nominal clauses,precisely,nominal relative clauses.
Macy's is
where I buy my clothes.
In this situations i.e when "where" is not preceded by a noun,dictionaries place it under the entry "conjunction",although I would say that is an adverb ,and also connects subordinate clause to its host clause.
And if possible,I would like you to give some example with the use of "where" as a relative pronoun.I stand by what I've said earlier about the definition from glossary:it is not understandable to me since it reads ..relative adverb is an adverbial pronoun..used to introduce a relative clause.I mean,I don't know about that terminology,although it is possible that author knows well about it.
Best regards
Velimir