Beastly laziness (5)

I believe the answer is:

sloth

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'laziness' is the definition.
(I know that laziness can be written as sloth)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for sloth that I've seen before include "Aversion to industry" , "Indolence" , "Torpor" , "Slow-moving arboreal mammal" , "tropical American native" .)

I've seen this clue in the Evening Standard.

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