Fluffy ball (6)
I believe the answer is:
pompom
'fluffy ball' is the definition.
(a pompom is a decorative fluffy ball)
This is all the clue.
(Other definitions for pompom that I've seen before include "Anti-aircraft weapon" , "Decorative ball of tufted wool" , "Top decoration" , "Cheerleader's ball of material" , "Hat ornament" .)