Shut up about our bravery (7)
I believe the answer is:
courage
'bravery' is the definition.
(synonyms)
'shut up about our' is the wordplay.
'shut up' becomes 'cage' (I've seen this in other clues).
'about' means one lot of letters goes inside another.
'cage' going around 'our' is 'COURAGE'.
(Other definitions for courage that I've seen before include "Valour" , "Grit" , "Bravery, heroism" , "Gallantry" , "See 6" .)