One proverbial object is vile mambo dancing (9)

I believe the answer is:

immovable

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'one proverbial object is' is the definition.
I can't judge whether this definition defines the answer.

'vile mambo dancing' is the wordplay.
'dancing' is an anagram indicator.
'vile'+'mambo'='vilemambo'
'vilemambo' is an anagram of 'IMMOVABLE'.

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(Other definitions for immovable that I've seen before include "fast" , "Impassive" , "Steadfast" , "Unyielding, fixed" , "Not able to be shifted" .)

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

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