Steel container (6)
I believe the answer is:
bottle
I believe this is a double definition.
'steel' is the first definition.
(both can mean determination or courage)
'container' is the second definition.
(bottle is a kind of container)
(Other definitions for bottle that I've seen before include "Here's where it's to be found" , "Type of marine mammal" , "Grit" , "beer found in this?" , "Pitcher perhaps" .)