AS previously stated Clarissa wasn't his wife as there is this marriage
JOHNSON Peter, adult, married BEAMES Clarissa Foxwell, ~18, on 1843-02-12 at St John, Ade
Jen
Jen is right

Clarissa Foxwell Beames parents have been a bit of a puzzle.
James Beames is her father and there is a question as to her Mother. The shipping records indicate that her mother is Clarissa but the death registration indicates that it is Emma (Beans).
I interpret the transcribed shipping information as James
BEAMES, his wife , [not named] his dau Clarissa Foxwell, and siblings. According to the mistranscribed death registration which I found, James wife was Emma.
BEAMES James, wife, Clarissa Foxwell, Geo, Jas, Em, 2 sons arrived in SA 1840-07-07 aboard Fairlie from London 04-04 [Source1(+James B EAMES),2,4,7(P JOHNSON),20,23(6,1),29]
Sources -
1. E A D Opie, South Australian Records prior to 1841, Adelaide, 1917
2. Register of Emigrant Labourers Applying for a Free Passage to South Australia 1836-41, PRO CO 386/149-151
4. South Australian Birth Registration Certificates Index 1842-1928, Genealogy SA, 2012
7. Biographical Index of South Australians 1836-1885, SAGHS, 1986
20 South Australian Marriage Registration Certificates Index 1842-1937, Genealogy SA, 2012
23 1841 South Australia Census Returns, SAA, GRG24/13
http://www.jaunay.com/cgi-bin/search-census.cgi29 Return of sick and destitute emigrants receiving relief 1840, SAA, GRG24/1
I suggest you search some of the resources for further info. 7 and 29 refer to
JOHNSON.
A public tree has the marriage by banns - the compiler appears to be a
FOXWELL researcher.
BEAMES James
FOXWELL Emma
26 Dec 1822 Wotton Under Edge, Gloucestershire, England
I think there has been some poor research and the online trees bar one, appear to have copied from one another.
Have you searched family search.org - the transcribed parish records
Cando