Laugh, glugging whiskey in state of excitement (7)
I believe the answer is:
'state of excitement' is the definition.
(I've seen this before)
'laugh glugging whiskey' is the wordplay.
'laugh' becomes 'titter' (tittering is a kind of laughing).
'glugging' indicates putting letters inside.
'whiskey' becomes 'W' (phonetic alphabet: alpha, bravo, charlie etc.).
'titter' going around 'w' is 'TWITTER'.
'in' is the link.
(Other definitions for twitter that I've seen before include "flutter" , "Latest craze in web-based messaging" , "Sound like small birds" , "Make high-pitched sounds, as of birds" , "(Make) a noise like a bird" .)