A merry-go-round (9)
I believe the answer is:
whirligig
'a merry-go-round' is the definition.
('whirligig' can be a synonym of 'merry-go-round')
This is the entire clue.
(Other definitions for whirligig that I've seen before include "Spinner" , "Spinning toy - dizzying events" , "Rapidly revolving item" , "Spinning top - water beetle" , "one that spins" .)