Feature of architect's car I adapted (14)
I believe the answer is:
characteristic
'feature' is the definition.
('characteristic' can be a synonym of 'feature')
'architect's car i adapted' is the wordplay.
'adapted' is an anagram indicator.
'architects'+'car'+'i'='architectscari'
'architectscari' anagrammed gives 'CHARACTERISTIC'.
'of' is the link.
(Other definitions for characteristic that I've seen before include "Trait" , "Typical (of a person or thing)" , "Typical of a particular person" , "Feature, quality" , "Distinctive" .)