Crossword Genius

Fibre in diets is a laxative (5)

Ross

I believe the answer is:

sisal

'fibre' is the definition.
(sisal is a kind of fibre)

'in diets is a laxative' is the wordplay.
'in' indicates the answer is hidden within the clue.
'SISAL' is hidden in the letters of 'diets is a laxative'.

(Other definitions for sisal that I've seen before include "Agave cultivated for its fibre" , "Rope fibre from leaves of tropical plant" , "Agave yielding fibre" , "Agave rope-fibre" , "Fibre used in rope-making" .)

I've seen this clue in The Times.
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