Suspect loved to empty room, revealing unspeakable villain (9)

I believe the answer is:

voldemort

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'unspeakable villain' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'suspect loved to empty room' is the wordplay.
'suspect' indicates anagramming the letters (a suspicious or unusual spelling).
'empty' suggests removing the centre.
'room' with its centre removed is 'rm'.
'loved'+'to'+'rm'='lovedtorm'
'lovedtorm' anagrammed gives 'VOLDEMORT'.

'revealing' acts as a link.

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

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