Piece of toasted bread criminal eats right away (7)
I believe the answer is:
crouton
'piece' is the definition.
(I have seen 'piece of bread' mean 'crouton' so perhaps 'piece' could also mean 'crouton')
'toasted bread criminal eats right away' is the wordplay.
I cannot quite see how this works, but
'right' could be 'r' (common abbreviation) and 'r' is found within the answer.
'away' could be 'out' ('out' can be a synonym of 'away') and 'out' is found within the answer.
'criminal' could be 'con' (abbreviation for 'convict') and 'con' is located in the remaining letters.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
'of' acts as a link.
(Other definitions for crouton that I've seen before include "Small cube of fried bread" , "fried food" , "Bit of toast in soup" , "Small piece of toasted or fried bread served in soup" , "Fried bread as garnish" .)