A leading spinner (3)
I believe the answer is:
top
I believe this clue is a double definition.
'a leading' is the first definition.
(both can mean first-class)
'spinner' is the second definition.
(a spinning top)
(Other definitions for top that I've seen before include "Summit, peak" , "Upper side" , "Zenith" , "Pinnacle" , "Toy; uppermost point" .)