Torso mauled where bats seen (5)

I believe the answer is:

roost

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'where bats seen' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'torso mauled' is the wordplay.
'mauled' indicates an anagram.
'torso' anagrammed gives 'ROOST'.

Can you help me to learn more?

(Other definitions for roost that I've seen before include "Thin paper" , "The cock rules it" , "Place for sleeping birds" , "In Orkney, the current" , "suitable sleeping-place" .)

I've seen this clue in The Sun.

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