Child receiving a second slice for breakfast? (5)
I believe the answer is:
toast
'slice for breakfast?' is the definition.
'child receiving a second' is the wordplay.
'child' becomes 'tot' (I've seen this before).
'receiving' is an insertion indicator.
'a second' becomes 'as' (I've seen this in other clues).
'tot' going around 'as' is 'TOAST'.
(Other definitions for toast that I've seen before include "meal component" , "Breakfast item served in rounds" , "Drink one's health" , "Raising of glasses" , "A bit of a bloomer, possibly" .)