Rotating cylinder; bird (6)
I believe the answer is:
roller
I believe this clue is a double definition.
'rotating cylinder' is the first definition.
(I've seen this before)
'bird' is the second definition.
(type of bird)
(Other definitions for roller that I've seen before include "Flattener for grass" , "Painting tool" , "Cylinder for flattening etc" , "Kind of skate" , "road maintenance vehicle" .)