Preserve with courage (6)
I believe the answer is:
bottle
This clue is a double definition.
'preserve' is the first definition.
(I've seen this before)
'courage' is the second definition.
(bottle can mean courage)
'with' acts as a link.
(Other definitions for bottle that I've seen before include "Nerve - container" , "beer found in this?" , "Container for liquids" , "cool" , "Nerve (sl.)" .)