Gave as a new description of a barbarian (6)
I believe the answer is:
savage
'description of a barbarian' is the definition.
'savage' can be an answer for 'barbarian' (synonyms). I am not certain of the 'description of a' bit.
'gave as a new' is the wordplay.
'a new' is an anagram indicator.
'gave'+'as'='gaveas'
'gaveas' with letters rearranged gives 'SAVAGE'.
Can you help me to learn more?
(Other definitions for savage that I've seen before include "Fierce, violent" , "Fierce and untamed" , "Fierce, cruel" , "Fierce, uncontrolled" , "Wild, barbarous" .)