Clarke was elected as Monaghan Ward councillor in 1998, then re-elected five times.
He sat as deputy mayor from 2004 until 2018, and was also chair of the city’s finance committee from 2007 - 2018.
Clarke is the second resident to announce a campaign for Mayor. Northcrest Ward Stephen Wright also announced he would be seeking the office.
Current Mayor, Diane Therrien, announced in November that she would not be seeking re-election.
The Municipal Election will take place on Oct. 24.