Scout, you aren’t old enough to understand some things yet, but there’s been some high talk around town to the effect that I shouldn’t do much about defending this man.
(Harper Lee, To Kill A Mockingbird)
Is ‘there’s’ the abbreviated form of ‘there is’ or ‘there has’?
If the former is right, for what meaning does the sentence use the passive form?
If the latter is right, is ‘there’ a dummy-adverb (I’ve not heard about it yet) and is its real adverb ‘around town’?