Bronze in Istanbul (3)
I believe the answer is:
tan
'bronze' is the definition.
('tan' can be a synonym of 'bronze')
'in istanbul' is the wordplay.
'in' says the answer is hidden in the clue.
'TAN' is hidden in the letters of 'istanbul'.
(Other definitions for tan that I've seen before include "Curry" , "Yellowish brown" , "Get the effect of the sun." , "Bark!" , "Sun-kissed" .)