Nonsense at end of conference is spin (6)
I believe the answer is:
rotate
'is spin' is the definition.
(thesaurus)
'nonsense at end of conference' is the wordplay.
'nonsense' becomes 'rot' (I've seen this before).
'end of' indicates one should take the final letters.
The last letter of 'conference' is 'e'.
'rot'+'at'+'e'='ROTATE'
(Other definitions for rotate that I've seen before include "wheel" , "Spin round" , "Spin as on axle" , "roll" , "Move round centre" .)