The slurs circulating are quite savage (8)
I believe the answer is:
ruthless
'quite savage' is the definition.
'ruthless' can be an answer for 'savage' (thesaurus). I am not sure about the 'quite' bit.
'the slurs circulating' is the wordplay.
'circulating' indicates anagramming the letters.
'the'+'slurs'='theslurs'
'theslurs' with letters rearranged gives 'RUTHLESS'.
'are' is the link.
Can you help me to learn more?
(Other definitions for ruthless that I've seen before include "Without pity or compassion" , "devoid of compassion" , "Showing no mercy" , "Without mercy or pity" , "Callous" .)