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Cop, what doubts can there be?
I'm proceeding from the assumption that all mafia and neutrals are not the town and are not immune.
Also, Clara is definitely immune, so with the third question, we separate her from the rest of the "bad guys."
At the same time, the poll finds a neutral. Because for him, the answer to the third question is true, and, of course, we tell all the townspeople to lie in the answer to the third question. That is, we directly say, in bold and larger font. We don't guess what options there are, but clearly tell the town to only lie on the third question.
That is, all townspeople except Clara answer yes, yes, yes*.
Clara: yes, yes, no*.
A neutral can answer:
Yes*, no, yes, no, yes*, yes, no, no, no*.
Mafia can answer:
Yes*, no, no, no, yes*, no, no, no, no*.
In essence, this is a clear distinction between town/not town. The mafia can reveal themselves as mafia or pretend to be a neutral; obviously, they will choose the latter.
A neutral can reveal themselves as a neutral or maintain the ambiguity of neutral/mafia, although the mafia will still find out the truth.
Added 3 minutes later
I think the poll is only relevant in the first night; after that, if the seer remains alive, he will become a blocker.
And I think that if the poll has a clear negative result, the first hanging will definitely end with the execution of a mafia member or the understanding of who the neutral is.
In the case where a player has a chance of being a sharpshooter, this will not happen. At the same time, for the mafia itself, he will be revealed, after which he will live for a certain amount of time.