Don't accept waste (6)
I believe the answer is:
refuse
'waste' is the definition.
(refuse is a kind of waste)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for refuse that I've seen before include "Turn away" , "Say no to garbage" , "Decline to accept garbage" , "'Deny, turn down (6)'" , "Decline to accept - rubbish" .)