Crossword Genius

Beastly idleness (5)

Ross

I believe the answer is:

sloth

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

I don't understand the rest of the clue.

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(Other definitions for sloth that I've seen before include "Deadly offence" , "Arboreal animal" , "Aversion to industry" , "Sinful" , "reluctance to work" .)

I've seen this clue in the Evening Standard.
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