Crossword Genius

Spencer Hertz has the odd skeleton on his cupboard perhaps (6)

Ross

I believe the answer is:

secret

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But I can't explain it at all! Could you help me understand?

(Other definitions for secret that I've seen before include "Private; classified" , "Clandestine, undercover" , "Cloak-and-dagger" , "Not public" , "Not generally known" .)

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