In the course of the Bengali video, really very angry (5)
I believe the answer is:
livid
'very angry' is the definition.
(I've seen this before)
'in the course of the bengali video really' is the wordplay.
'in the course of' indicates a hidden word.
'LIVID' is hidden within 'bengali video really'.
(Other definitions for livid that I've seen before include "Black and blue" , "Lead-coloured, being furiously angry" , "Unpleasantly colourful" , "Fuming" , "Angry (person, bruise)" .)