Sipped her bubbly after he's prepared meal (9,3)
I believe the answer is:
shepherds pie
'meal' is the definition.
(shepherd's pie is a type of dish)
'sipped her bubbly after he's prepared' is the wordplay.
'bubbly' indicates an anagram.
'after' says to put letters next to each other.
'prepared' indicates an anagram.
'sipped'+'her'='sippedher'
'sippedher' anagrammed gives 'pherdspie'.
'hes' is an anagram of 'she'.
'pherdspie' after 'she' is 'SHEPHERDS PIE'.
(Other definitions for shepherds pie that I've seen before include "Lamb and potato dish" , "Meat-and-potato dish" , "Mashed potato and minced meat, baked" , "Minced meat dish" , "lunch" .)