Move that junk! (6)
I believe the answer is:
lumber
This clue might be a double definition.
'move' is the first definition.
The answer and definition can be both to do with motion as well as being verbs in their base form.
Perhaps there's an association between them I don't understand?
'junk' is the second definition.
(thesaurus)
'that' is the link.
Can you help me to learn more?
(Other definitions for lumber that I've seen before include "Move in ungainly way" , "Sawn wood ready for use" , "Walk heavily with untreated timber" , "Burden with an unwanted task" , "articles in storage" .)