Bring us histrionics, about to enthuse (4)
I believe the answer is:
gush
'to enthuse' is the definition.
(I've seen this in another clue)
'bring us histrionics about' is the wordplay.
'about' indicates a hidden word (the clue goes around or about the answer).
'GUSH' can be found hidden inside 'bring us histrionics'.
(Other definitions for gush that I've seen before include "Sudden stream or jet" , "Flow unceasingly" , "Effuse" , "Talk effusively" , "Spout like geyser" .)