Peep's dish her undoing? Traditional meat dish (9,3)
I believe the answer is:
shepherds pie
'meat dish' is the definition.
(I've seen this before)
'peep's dish her undoing?' is the wordplay.
'undoing?' is an anagram indicator.
'peeps'+'dish'+'her'='peepsdishher'
'peepsdishher' is an anagram of 'SHEPHERDS PIE'.
'traditional' is the link.
This may not be right. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for shepherds pie that I've seen before include "Mashed potato and minced meat, baked" , "Meat-and-potato dish" , "Mince and mashed potato dish" , "Minced meat dish" , "Food" .)