Banter concerning role, extremely emotive (8)
I believe the answer is:
repartee
'banter' is the definition.
(I've seen this before)
'concerning role extremely emotive' is the wordplay.
'concerning' becomes 're'.
'role' becomes 'part' ('part' can be a synonym of 'role').
'extremely' suggests removing the centre.
'emotive' with its middle removed is 'ee'.
're'+'part'+'ee'='REPARTEE'
(Other definitions for repartee that I've seen before include "Quick and witty conversation" , "that may sound funny" , "comeback" , "Smart retorts or witty replies" , "Witty exchange" .)