Her dish — Peep’s — potentially? (9,3)
I believe the answer is:
shepherds pie
'her dish peep's potentially?' is the definition.
I can't tell whether this defines the answer.
'her dish peep's potentially?' is the wordplay.
'potentially?' is an anagram indicator (letters have the potential to spell a new word).
'her'+'dish'+'peeps'='herdishpeeps'
'herdishpeeps' with letters rearranged gives 'SHEPHERDS PIE'.
(Other definitions for shepherds pie that I've seen before include "Minced meat dish" , "Lamb and potato dish" , "Food" , "lunch" , "Mince and mashed potato dish" .)