Hi
Looking at the 1841 census I think he's the one in Bury St Edmunds no sign of parents.Can't be the one in Clare as he goes on to marry someone else.
At a guess I'd go for Joseph Hammond bapt Blaxhall 25.12.1820 born 7.11.1817 to John Hammond and Elizabeth nee Knight but it would be just a guess.
His marriage cert would give his father.
Ciderdrinker