Colleagues do scream excitedly (8)
I believe the answer is:
comrades
'colleagues' is the definition.
(I've seen this before)
'do scream excitedly' is the wordplay.
'excitedly' indicates anagramming the letters (letters excited or stimulated into a new form).
'do'+'scream'='doscream'
'doscream' is an anagram of 'COMRADES'.
(Other definitions for comrades that I've seen before include "Associates" , "Staunch companions, sometimes in arms" , "Colleagues" , "Friends or fellow-workers" , "Friends, companions" .)