Inbuilt, inherent (8)
I believe the answer is:
integral
I believe this clue is a double definition.
'inbuilt' is the first definition.
(synonyms)
'inherent' is the second definition.
(synonyms)
(Other definitions for integral that I've seen before include "Large tin (anag.)" , "Triangle (anag)" , "using no fractions" , "Entire, whole" , "Unimpaired" .)