Crossword Genius

Dig your heels in litter (6)

Ross

I believe the answer is:

refuse

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'litter' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for refuse that I've seen before include "Trash" , "Junk" , "Waste, garbage" , "'Deny, turn down (6)'" , "Turn down - rubbish" .)

I've seen this clue in the Sydney Morning Herald.
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