A piece to start eating? (4)
I believe the answer is:
bite
This could be a double definition.
'a piece' is the first definition.
(thesaurus)
'start eating?' is the second definition.
'bite' can be an answer for 'eating?' (bite is a kind of eating). I am not certain of the 'start' bit.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for bite that I've seen before include "Mouthful" , "Small amount of food" , "Light meal" , "Pungency" , "Cut with the teeth" .)