Shout out of bravery (4)
I believe the answer is:
rave
'shout' is the definition.
(thesaurus)
'of bravery' is the wordplay.
'of' says the answer is hidden in the clue.
'RAVE' can be found hidden inside 'bravery'.
'out' acts as a link.
(Other definitions for rave that I've seen before include "Rapturous" , "Rage" , "Talk wildly in modern youth dance" , "Enthusiastically favourable review" , "Talk wildly, rant" .)