Does our plumber do exorcisms?
A Clawfoot Tub is a type of bath tub with legs, here, that tub has come alive with the person inside, and it's walking down the hallway. An inanimate object might come alive if a demon possessed it. In this case, the man is asking if their plumber, who is familiar with clawfoot bathtub repair, is also capable of doing an exorcism (i.e., a ritual to rid someone/something of a demonic possession): both skills would be useful in this case.