Looks like Jane Clugston had at least 3 children where the father's name was not recorded:
CLUGSTON, Jessie 4 Nov 1887
Rushen159
Not given/CLUGSTON, Jane
CLUGSTON, Lucy May 31 May 1891
Rushen202
Not given/CLUGSTON, Jane
CLUGSTONE, John Herbert 6 Jul1896
Castletown167
Not givenCLUGSTONE, Jane