Sylvester, to Tweety (3)
I believe the answer is:
tat
'sylvester to tweety' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tat that I've seen before include "Shoddy articles" , "Tawdry stuff" , "trashy clothing" , "Tawdry and shabby article" , "Tasteless articles" .)