Filth or rude farce (6)

I believe the answer is:

ordure

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'filth' is the definition.
(I've seen this before)

'or rude farce' is the wordplay.
'or rude' can be anagrammed to 'ORDURE'.
But, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for ordure that I've seen before include "Dung, filth" , "soil" , "unclean" , "Dirt" , "Excrement" .)

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

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