Since civil registration in New York didn't start until 1880, odds are that the town clerk won't have what you're looking for.

You can try the Rossie town historian, whose address you can get from the St Lawrence County Historical Association website:

http://slcha.org/

You can find the roster of all officials in Saint Lawrence County at the county's website:

http://www.co.st-lawrence.ny.us/County_Clerk/ROSTER.htm