Exhausted, no longer able to keep up? (5,2,4)
I believe the answer is:
ready to drop
'exhausted' is the definition.
(I've seen this in another clue)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for ready to drop that I've seen before include "exhausted?" , "Tired" , "Are autumn leaves" , "like a parachutist just before dive?" .)