Outrage concealed content? Fair enough! (3)
I believe the answer is:
ire
'outrage' is the definition.
(I've seen this before)
'concealed content? fair enough' is the wordplay.
'concealed' says the answer is hidden in the clue.
'IRE' can be found hidden inside 'content fair enough'.
(Other definitions for ire that I've seen before include "exasperation" , "Anger among admirers" , "heat" , "Outrage" , "passion" .)