Have no truck with junk (6)
I believe the answer is:
refuse
'junk' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for refuse that I've seen before include "deadwood" , "litter" , "Decline to accept garbage" , "Decline to jump (a fence)" , "Say no to - rubbish" .)