Violently hurt by quiet bird (6)
I believe the answer is:
thrush
'bird' is the definition.
(thrush is a kind of bird)
'violently hurt by quiet' is the wordplay.
'violently' indicates anagramming the letters.
'by' says to put letters next to each other.
'quiet' becomes 'sh'.
'hurt' anagrammed gives 'thru'.
'thru'+'sh'='THRUSH'
(Other definitions for thrush that I've seen before include "Common British songbird" , "Brown songbird" , "Songbird with brownish back and speckled breast" , "Speckled songbird or throat infection" , "Small bird - fungal mouth infection" .)