There certainly are a lot of men named John Clegg who were born in Rochdale in 1812. More specifics are needed to determine which one is right. Can you share additional information such as name of wife or children, whether he lived in Rochdale when he married and so on.
John Clegg
England Births and Christenings, 1538-1975
christening:
7 June 1812
Rochdale, Lancashire, England
residence:
Milnrow, Lancashire, England
John Clegg
England Births and Christenings, 1538-1975
christening:
30 August 1812
St. Chad's, Rochdale, Lancashire, England
residence:
Rochdale, Lancashire, England
John Clegg
England Births and Christenings, 1538-1975
christening:
16 February 1812
St. Chad's, Rochdale, Lancashire, England
residence:
Rochdale, Lancashire, England
John Clegg
England Births and Christenings, 1538-1975
christening:
8 November 1812
St. Chad's, Rochdale, Lancashire, England
residence:
Rochdale, Lancashire, England
John Clegg
England Births and Christenings, 1538-1975
christening:
16 February 1812
St. Chad, Rochdale, Lancashire, England
residence:
Rochdale, Lancashire, England
John Clegg
England Births and Christenings, 1538-1975
christening:
27 December 1812
St. Chad, Rochdale, Lancashire, England
residence:
Rochdale, Lancashire, England
John Clegg
England Births and Christenings, 1538-1975
christening:
27 December 1812
St. Chad's, Rochdale, Lancashire, England
residence:
Rochdale, Lancashire, England
John Clegg
England Births and Christenings, 1538-1975
christening:
30 August 1812
St. Chad, Rochdale, Lancashire, England
residence:
Rochdale, Lancashire, England
John Clegg
England Births and Christenings, 1538-1975
christening:
8 November 1812
St. Chad, Rochdale, Lancashire, England
residence:
Rochdale, Lancashire, England