What mother has to eat, to start and to finish (6)
I believe the answer is:
tomato
'eat to start and to finish' is the definition.
I can't tell whether this definition defines the answer.
'what mother has to' is the wordplay.
'what' becomes 'to' (I can't explain this - if you can you should believe this answer much more).
'mother' becomes 'ma' (Ma is another word for mother or mum).
'has' is a charade indicator (letters next to each other).
'to'+'ma'+'to'='TOMATO'
Can you help me to learn more?
(Other definitions for tomato that I've seen before include "Love apple (or "beef" fruit?)" , "Part of a BLT sandwich" , "Type of sauce" , "Pulpy fruit eaten as vegetable" , "Love apple (archaic)" .)