Study cites ruins in Byzantine state (10)
I believe the answer is:
scrutinise
'study' is the definition.
('study'->'scrutinize' is in my internal thesaurus and 'ize'->'ise')
'cites ruins in byzantine state' is the wordplay.
'cites ruins' can be anagrammed to 'SCRUTINISE'.
But, I'm unsure how this is indicated.
Can you help me to learn more?
(Other definitions for scrutinise that I've seen before include "Carefully examine" , "Examine closely - runs cities (anag)" .)