Bitter speech from US prosecutor about island breed (8)
I believe the answer is:
diatribe
'bitter speech' is the definition.
'us prosecutor about island breed' is the wordplay.
'us prosecutor' becomes 'da' (district attorney).
'about' indicates putting letters inside.
'island' becomes 'i'.
'breed' becomes 'tribe' (I've seen this before).
'da' going around 'i' is 'dia'.
'dia'+'tribe'='DIATRIBE'
'from' acts as a link.
(Other definitions for diatribe that I've seen before include "A prolonged tirade or abusive speech" , "A Prolonged harangue" , "Stream of invective" , "Bitter verbal attack" , "provoking verbal onslaught" .)