Prep dishes he's cooking for meal (9,3)
I believe the answer is:
shepherds pie
'meal' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'prep dishes he's cooking' is the wordplay.
'cooking' is an anagram indicator.
'prep'+'dishes'+'he'='prepdisheshe'
'prepdisheshe' is an anagram of 'SHEPHERDS PIE'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for shepherds pie that I've seen before include "Minced meat topped with mashed potato" , "Mince and mashed potato dish" , "Minced meat dish" , "Meat-and-potato dish" , "Mashed potato and minced meat, baked" .)