Hyperion, for one, it being cast in bronze (5)
I believe the answer is:
titan
'hyperion for one' is the definition.
(I know that Hyperion is Titan)
'it being cast in bronze' is the wordplay.
'being cast in' means one lot of letters goes inside another.
'bronze' becomes 'tan' (both can mean to get a sun tan).
'it' put within 'tan' is 'TITAN'.
(Other definitions for titan that I've seen before include "enormous thing" , "One huge" , "immense figure" , "Huge(ly important) type" , "One of elder gods defeated by Zeus" .)