I omit Peg suffering having skin disease (8)
I believe the answer is:
impetigo
'skin disease' is the definition.
(I know that impetigo is a type of skin disease)
'i omit peg suffering' is the wordplay.
'suffering' indicates an anagram.
'omit'+'peg'='omitpeg'
'omitpeg' is an anagram of 'mpetigo'.
'i'+'mpetigo'='IMPETIGO'
'having' acts as a link.
(Other definitions for impetigo that I've seen before include "sickness" , "Contagious skin disease with crusty spots" , "Contagious skin disease causing crusted spots" , "I omit peg to get the childhood skin infection" , "Contagious skin infection common in children" .)