Animals captured in bronze, brass, etc. (6)
I believe the answer is:
zebras
'animals' is the definition.
(I've seen this before)
'captured in bronze brass etc' is the wordplay.
'captured in' says the answer is hidden in the clue.
'ZEBRAS' is hidden within 'bronze brass etc'.
(Other definitions for zebras that I've seen before include "Striped horse-like animals" , "Striped mammals" , "Black and white equines" , "Black-and-white striped African equines" , "Black and white striped animals" .)