Throw a loop (5)
I believe the answer is:
sling
This clue might be a double definition.
'throw' is the first definition.
(chuck means throw as does sling)
'a loop' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?
Can you help me to learn more?
(Other definitions for sling that I've seen before include "throwing implement like catapult" , "Sweetened drink with spirit base" , "Simple weapon; throw" , "Old weapon or supporting strap" , "Cast - used for injured arm" .)