So is it John Norsworthy's spouse that you're really trying to find ?
Which John is he, date & place of birth?
It looks as if the other couple on the same page (freebmd marriage 1855) Thomas Edward Drake and Caroline Mason Broderick did marry, they seem to be in Widecombe in 1861 census, so I think you're right that John Norsworthy did marry Ann Hamlyn Coaker.
Will have another look, but the closest match I can see is in Plymouth, John Norsworthy born c.1822 Newton,wife Ann M b. c1823 Widecombe and daughter Mary b. c1854 Totnes - was that the Ann you were looking for?
edit: Have just found a marriage for Ann Hamlyn SMERDON to William COAKER Dec.Qu 1845 Newton Abbot 10/259, so will look for them in 1851 - if William had died by then she could be the one in the census I gave you
Just checked the 1841 census for William, and I think this is him with the same family I gave you for 1851, so looking possible! Can't find William in 1851
1841 HO107/232/6 fol.5 p.4
Bellaford, Lidford, Devon
COAKER
John 45 Farmer Y (b.in county)
Ann 40 N (not b. in county)
John 20 Y
William 15 Y
Ann 15 Y
Richard 30 M.S Y
Barbara