I've got everything in bags, say, ready for landing (6)
I believe the answer is:
impact
'landing' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for impact that I've seen before include "Force of colllision or blow" , "Forceful contact between two objects" , "Significance" , "Serious effect" , "Force exerted by collision" .)