Fluffy ball (6)
I believe the answer is:
pompom
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fluffy ball</span>' is the definition.<br/ ><span class="explanation-format__explanation">(a pompom is a decorative fluffy ball)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)