Nonsense consumed is spin (6)
I believe the answer is:
rotate
'is spin' is the definition.
(I've seen this in another clue)
'nonsense consumed' is the wordplay.
'nonsense' becomes 'rot' (rot can mean nonsense or rubbish).
'consumed' becomes 'ate' (to eat is to consume food).
'rot'+'ate'='ROTATE'
(Other definitions for rotate that I've seen before include "Go around" , "Turn around an axle, swivel" , "Make to spin around" , "Gyrate" , "Pivot" .)