Concealed by Jo Davidson back working in the opera house (4)

I believe the answer is:

diva

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'back working in the opera house' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?

I can't explain the rest of the clue.

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(Other definitions for diva that I've seen before include "Great performer" , "Grand female singer" , "fat lady?" , "Operatic female singer" , "A female opera singer" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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