Impact on belly as breakfast arriving? (7,7)
I believe the answer is:
pancake landing
'impact on belly' is the definition.
(emergency landing where a plane lands on its belly)
'breakfast arriving?' is the wordplay.
'breakfast' becomes 'pancake' (pancakes might be eaten for breakfast).
'arriving?' becomes 'landing' (landing is a kind of arriving).
'pancake'+'landing'='PANCAKE LANDING'
'as' acts as a link.
(Other definitions for pancake landing that I've seen before include "Crash course for pilot" , "Emergency touchdown" , "happening on Shrove Tuesday" .)