Crossword Genius

Taking most of bed, the fat lady? (4)

Ross

I believe the answer is:

diva

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'fat lady?' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

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(Other definitions for diva that I've seen before include "Great performer" , "High-maintenance opera singer?" , "Callas, say" , "Long narrow top" , "Operatic soprano" .)

I've seen this clue in The Sun and The Independent.
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