Dad's emptied the sandwich spread? (5)
I believe the answer is:
paste
'spread?' is the definition.
(I know that spread can be written as paste)
'dad's emptied the sandwich' is the wordplay.
'dad's' becomes 'pa's' (pa can mean someone's father).
'emptied' suggests removing the centre.
'the sandwich' becomes 'toastie' (toasted sandwich).
'toastie' with its middle removed is 'te'.
'pas'+'te'='PASTE'
(Other definitions for paste that I've seen before include "Creamy, sticky, or doughy mixture" , "Adhesive, for wallpaper say" , "Sticky stuff" , "It may be put on teeth" , "Food for spreading or fixative" .)