Ear piece? (6)
'ear piece?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for kernel that I've seen before include "Essence" , "Contents of shell" , "Central or most important part" , "Inner part of a seed or grain" , "Nucleus" .)
(Other definitions for fluff that I've seen before include "Light downy substance - mistake?" , "Soft downy substance - bungle it" , "Error" , "Deliver badly" , "The fuzz" .)