Angry words from group of three dividing six pounds (7)
I believe the answer is:
vitriol
'angry words' is the definition.
(vitriol means angry criticism)
'group of three dividing six pounds' is the wordplay.
'group of three' becomes 'trio' (eg group of three musicians).
'dividing' indicates putting letters inside (inserted letters divide the word).
'six' becomes 'VI' (Roman numerals).
'pounds' becomes 'l' (L can represent the monetary pound).
'vi'+'l'='vil'
'trio' placed inside 'vil' is 'VITRIOL'.
'from' acts as a link.
(Other definitions for vitriol that I've seen before include "Sulphuric acid and hateful criticism" , "Kind of acid or savage criticism" , "Acid -- caustic writings" , "Abusive language - sulphuric acid" , "Sulphuric acid or caustic criticism" .)