Blurt out about a savage (6)
I believe the answer is:
brutal
'savage' is the definition.
(I know that savage can be written as brutal)
'blurt out about a' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'about' is an insertion indicator.
'blurt' anagrammed gives 'brutl'.
'brutl' going around 'a' is 'BRUTAL'.
(Other definitions for brutal that I've seen before include "Callous" , "Savage and cruel" , "Rottweiler" , "Cruel and unfeeling like an animal" , "cruelly savage" .)