Kind of cat to make a fellow cross? (4)
I believe the answer is:
manx
'kind of cat' is the definition.
(I know that Manx is a type of house cat)
'a fellow cross?' is the wordplay.
'a fellow' becomes 'man' (fellow can mean a man).
'cross?' becomes 'x' (an X is a cross).
'man'+'x'='MANX'
'to make' is the link.
(Other definitions for manx that I've seen before include "Celtic language, relating to the Isle of Man" , "Breed of tailless cat" , "Isle of Man's language" , "To do with the Isle of Man - say a cat" , "Adjective indicating the Isle of Man" .)