Gathers what may be speed around endlessly (5)
I believe the answer is:
reaps
'gathers' is the definition.
(reaping is a kind of gathering)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for reaps that I've seen before include "Harvests (a crop)" , "Gleans or harvests" , "Harvests with strange spear" , "Cuts, gathers grain" , "crops" .)