Question: Which city's southern suburbs were the location of an electoral district which lost Labor-voting areas to Victoria Park, Canning and Welshpool, and became substantially safer for the major political party in Australia founded in 1945?
Sentence (from "Electoral district of Clontarf"): Clontarf was an electoral district of the Legislative Assembly in the Australian state of Western Australia from 1968 to 1989.
Relevant evidence: Yes