That thing in bronze is a Greek god (5)
I believe the answer is:
titan
'a greek god' is the definition.
(Titan is an example)
'that thing in bronze' is the wordplay.
'that thing' becomes 'it'.
'in' means one lot of letters goes inside another.
'bronze' becomes 'tan' (both can mean to get a sun tan).
'it' inserted inside 'tan' is 'TITAN'.
'is' acts as a link.
(Other definitions for titan that I've seen before include "Giant god of Greek myth" , "One of the mythological Greek giants who ruled the world" , "Gigantic Greek god" , "Giant god of Gr. myth" , "Jolly large figure" .)