Clutter-free (4)
I believe the answer is:
neat
'clutter-free' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for neat that I've seen before include "Cool - without a mixer" , "In good order, tidy" , "Clean and tidy" , "Tidy - orderly" , "bull, eg" .)