Crossword Genius

Hotels working without energy - idleness (5)

Ross

I believe the answer is:

sloth

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

I cannot understand how the rest of the clue works.

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(Other definitions for sloth that I've seen before include "Idleness" , "Arboreal animal" , "One hangs a lot" , "Arboreal creature" , "Idle creature" .)

I've seen this clue in The Mirror.
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