Relative got acne badly (7)
I believe the answer is:
cognate
'relative' is the definition.
(cognate is a kind of relative)
'got acne badly' is the wordplay.
'badly' is an anagram indicator.
'got'+'acne'='gotacne'
'gotacne' with letters rearranged gives 'COGNATE'.
(Other definitions for cognate that I've seen before include "Associated" , "Related, having same source" , "Related by blood" , "Having the same source or origin" , "Affiliated" .)