Hidden by tutu, monstrous belly (3)

I believe the answer is:

tum

'belly' is the definition.
(I've seen this before)

'hidden by tutu monstrous' is the wordplay.
'hidden' indicates a hidden word.
'TUM' is hidden in the letters of 'by tutu monstrous'.

(Other definitions for tum that I've seen before include "Corporation" , "Middle" , "Belly" , "Stomach (informal)" .)

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

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