Byzantine art I've seen in Istanbul perhaps displays originality (10)
I believe the answer is:
creativity
'originality' is the definition.
(thesaurus)
'byzantine art i've seen in istanbul perhaps' is the wordplay.
'byzantine' is an anagram indicator.
'seen in' means one lot of letters goes inside another.
'istanbul perhaps' becomes 'city' (istanbul is a kind of city).
'art'+'ive'='artive'
'artive' anagrammed gives 'reativ'.
'reativ' going within 'city' is 'CREATIVITY'.
'displays' acts as a link.
(Other definitions for creativity that I've seen before include "Inventiveness" , "imagination" , "Inventive or imaginative power" .)