Lingfield is about 4 miles north of East Grinstead and that is where Clara's birth was registered:
"England and Wales Birth Registration Index, 1837-2008," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2X6V-P19 : 1 October 2014), Clara Knight, 1877; from "England & Wales Births, 1837-2006," database, findmypast (http://www.findmypast.com : 2012); citing Birth Registration, East Grinstead, Sussex, England, citing General Register Office, Southport, England.
I confirmed this is the correct Clara by looking on the GRO site (https://www.gro.gov.uk/gro/content/certificates/indexes_search.asp) which gives this Clara's mother's maiden name as Skinner. The other births for surname Knight with mother's maiden name Skinner registered in East Grinstead around this time are:
Robert, Oct-Dec 1858
William, Oct-Dec 1859
Edward, Apr-Jun 1861
Delia, Jan-Mar 1863
Edith, Aug-Sep 1864
Alfred, Oct-Dec 1866
James, Apr-Jun 1869
Thomas, Aug-Sep 1871
Jane, Aug-Sep 1874
This fits perfectly with the 1881 census that you linked, where William, Edward, James, Thomas and Jane are all living with Clara and their parents.