Burden with clutter (6)
I believe the answer is:
lumber
I believe this is a double definition.
'burden' is the first definition.
(thesaurus)
'clutter' is the second definition.
(thesaurus)
'with' is the link.
(Other definitions for lumber that I've seen before include "Sawn wood - be a burden to" , "Jumble" , "Sawn wood ready for use" , "Move in a heavy way, with partly treated wood" , "Move awkwardly - unwanted household items" .)