Fancy attic’s rare in trendy property (14)
I believe the answer is:
characteristic
'property' is the definition.
(I know that characteristic is a type of property)
'fancy attic's rare in trendy' is the wordplay.
'fancy' indicates an anagram.
'in' indicates putting letters inside.
'trendy' becomes 'chic' (I've seen this before).
'attics'+'rare'='atticsrare'
'atticsrare' is an anagram of 'aracterist'.
'aracterist' placed within 'chic' is 'CHARACTERISTIC'.
(Other definitions for characteristic that I've seen before include "Distinctive" , "Typical (of a person or thing)" , "Typical of a particular person" , "Trait" , "Feature, quality" .)