Not a difficult thing to eat? (5,2,4)
I believe the answer is:
piece of cake
'not a difficult thing' is the definition.
I can't judge whether this defines the answer.
'eat?' is the wordplay.
I cannot really see how this works, but
'eat?' could be 'piece' (piecing is a kind of eating) and 'piece' is found within the answer.
This explanation may well be incorrect...
'to' is the link.
Can you help me to learn more?
(Other definitions for piece of cake that I've seen before include "slice?" , "Part of Madeira perhaps" , "one can sail through?" , "Easy task" , "It's easy (to eat)" .)