Congenital, hereditary (6)
I believe the answer is:
inborn
I believe this clue is a double definition.
'congenital' is the first definition.
(synonyms)
'hereditary' is the second definition.
(I've seen this in another clue)
(Other definitions for inborn that I've seen before include "naturally!" , "Congenital" , "Innate, natural" , "that's natural" , "Normally existing at birth" .)