I tried www.familysearch.org found following:
1. JOHN CLEATER - International Genealogical Index / BI
Gender: Male Christening: 18 DEC 1785 Saint Mathews, Douglas, Isle Of Man, England
2. JOHN CLEATER - International Genealogical Index / BI
Gender: Male Christening: 24 DEC 1790 Andreas, Isle Of Man, England
Matches: International Genealogical Index/British Isles - 2
If you enter the web-site www.familysearch.org follow page box entries then click search, click on each John Cleator this will give parents names.
According to your date 1785 this needs verifiying with parish church records, hope this helps.
Brian ....... www.kneen.com