Angry speech in new arena, huge, cut short (8)
I believe the answer is:
harangue
'angry speech' is the definition.
(harangue means a long, angry speech)
'new arena huge cut short' is the wordplay.
'new' indicates anagramming the letters.
'cut short' means to remove the last letter.
'arena'+'huge'='arenahuge'
'arenahuge' with its last letter taken off is 'arenahug'.
'arenahug' is an anagram of 'HARANGUE'.
'in' is the link.
(Other definitions for harangue that I've seen before include "Declamation - lecture" , "Pompous speech" , "Hectoring lecture" , "address" , "Lecture aggressively" .)