Cooked alternative to ploughman's lunch? (9,3)
I believe the answer is:
shepherds pie
'lunch?' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for shepherds pie that I've seen before include "Mince and mashed potato dish" , "Lamb and potato dish" , "lunch" , "Minced meat topped with mashed potato" , "Mashed potato and minced meat, baked" .)