Tweets leading to crazy speech (6)
I believe the answer is:
cheeps
'tweets' is the definition.
(both can refer to birdsong)
'crazy speech' is the wordplay.
'crazy' is an anagram indicator.
'speech' anagrammed gives 'CHEEPS'.
'leading to' is the link.
(Other definitions for cheeps that I've seen before include "Speech like bird cries" , "The sound" , "Bird sounds" , "as exemplified in some tweets" .)