Bottom surface in stiff loo roll (5)

I believe the answer is:

floor

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

'in stiff loo roll' is the wordplay.
'in' indicates the answer is hidden within the clue.
'FLOOR' is hidden in the letters of 'stiff loo roll'.

(Other definitions for floor that I've seen before include "Lower limit" , "Storey of a building" , "Dumbfound" , "American's story" , "Disconcert" .)

I've seen this clue in The Independent.

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