Tweeted about husband becoming excited (8)
I believe the answer is:
thrilled
'excited' is the definition.
(thrilling is a kind of exciting)
'tweeted about husband' is the wordplay.
'tweeted' becomes 'trilled' (tweet and trill can both mean to sing as a bird).
'about' indicates putting letters inside.
'husband' becomes 'h'.
'trilled' enclosing 'h' is 'THRILLED'.
'becoming' is the link.
(Other definitions for thrilled that I've seen before include "Exhilarated" , "Feeling intense pleasurable excitement" , "Delighted" , "Excited and pleased" .)