Hi,
I think the 1946 marriage is a different Clara, I found these,
Birth
Clara Millicent LAINCHBURY Mar Q 1907 Aston 6d 289
If you look for Millicent C LAINCHBURY in the next census you will find her in Wednesbury, Staffordshire.
Then a Clara M LAINCHBURY marries John BIRCH in 1946 in Wednesbury, this registration district was created out of West Bromwich in 1932.
Here is a matching death,
Death
Clara Millicent BIRCH Wolverhampton Jan 1997
DOB: 6 December 1906
I think this is the death for 'your' Clara,
Clara M LAINCHBURY 1950 Weston-Super-Mare 7c 300
Age: 80
Regards,
Daisy