Painful boils oddly ignored by deity (6)
I believe the answer is:
anubis
'deity' is the definition.
(Anubis is an example)
'painful boils oddly ignored' is the wordplay.
'oddly ignored' indicates alternate letters.
'painful'+'boils'='painfulboils'
The alternating letters of 'painfulboils' are 'ANUBIS'.
'by' is the link.
(Other definitions for anubis that I've seen before include "one Egyptians thought great" , "Egyptian god - in a bus (anag)" , "Egypt. jackal-headed god" , "Is a bun about the ancient Egyptian god of the dead" , "Egyptian jackal-headed god" .)