What the toast may do when dad gets out of bed (3,2)
I believe the answer is:
pop up
'what the toast may do' is the definition.
The definition suggests a singular noun but the answer is not.
'dad gets out of bed' is the wordplay.
'dad' becomes 'pop' (synonyms).
'gets' means one lot of letters go next to another.
'out of bed' becomes 'up' (synonyms).
'pop'+'up'='POP-UP'
'when' acts as a link.
Can you help me to learn more?
(Other definitions for pop up that I've seen before include "book for youngster" , "three-dimensional picture book" , "Appear suddenly or unexpectedly" , "which may interrupt computer user" , "Appear (like toast?)" .)