Read out tawdry tweet (5)
I believe the answer is:
cheep
'tweet' is the definition.
(thesaurus)
'read out tawdry' is the wordplay.
'read out' shows a homophone (sound like).
'tawdry' becomes 'cheap' ('cheap' can be a synonym of 'tawdry').
'cheap' sounds like 'CHEEP'.
(Other definitions for cheep that I've seen before include "Chirrup" , "Bird noise" , "Weak cry of young bird" , "Cry of new-born chick" , "Make contribution to Twitter" .)