Tweeted or trilled (4)
I believe the answer is:
sang
This clue is a double definition.
'tweeted' is the first definition.
(I've seen this in another clue)
'trilled' is the second definition.
(I've seen this in another clue)
(Other definitions for sang that I've seen before include "produced a melody" , "squealed" , "Chinese organ" , "Spilt the beans" , "Chorused" .)