He asked if she had any 'skeletons in her closet' that might affect her political campaign.
She's a 'closet' racist. [=she does not want people to know that she is a racist]
The manager 'was closeted' with one of her employees for several hours.
(..) You know how everything goes with police officers like me. There are families, companies, which are formed around those who have the same skeleton in their closets. Outwardly, all's well but we do nothing. In particular, we are not trying to understand with whom it begins and ends. (..)1981 To Kill a Cop