Mocks a little boy getting out of bed (7)
I believe the answer is:
debunks
'mocks a little' is the definition.
I can't judge whether this defines the answer.
'boy getting out of bed' is the wordplay.
'boy' becomes 'des' (short for Desmond).
'getting out of' means one lot of letters goes inside another (to be outside something can mean to be around it).
'bed' becomes 'bunk' (bunk is a kind of bed).
'des' enclosing 'bunk' is 'DEBUNKS'.
Can you help me to learn more?
(Other definitions for debunks that I've seen before include "Shows to be false" , "Exposes while ridiculing pretentious or false claims" .)