Rabbit stuffing Loretta Young served up (6)
I believe the answer is:
yatter
'rabbit' is the definition.
(I've seen this before)
'stuffing loretta young served up' is the wordplay.
'stuffing' says the answer is hidden in the clue.
'served up' says the letters should be written backwards (in a down clue, going upwards).
'rettay' is hidden within 'loretta young'.
'rettay' written backwards gives 'YATTER'.
(Other definitions for yatter that I've seen before include "Talk idly" , "conversation" , "rabbit on endlessly" , "Go on and on" , "jabber" .)