Inconsequential material (5)
I believe the answer is:
fluff
'inconsequential material' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for fluff that I've seen before include "Make a mistake" , "picked up by vacuum cleaner?" , "Trifling" , "Downy stuff; get (lines) wrong" , "The fuzz" .)