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To be heartless, old and dirty is an unusual thing (6)

Ross

I believe the answer is:

oddity

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

I can't explain the rest of the clue.

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(Other definitions for oddity that I've seen before include "Unusual thing" , "rare thing" , "Something strange or eccentric" , "Curious item" , "Quality of strangeness" .)

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