Crossword Genius

Lie about what is in roughage (5)

Ross

I believe the answer is:

fibre

'what is in roughage' is the definition.
(roughage means food containing fibre)

'lie about' is the wordplay.
'lie' becomes 'fib' (fib is a kind of lie).
'about' becomes 're' ('re' means regarding or about).
'fib'+'re'='FIBRE'

(Other definitions for fibre that I've seen before include "Coarse plant food, low in nutrients" , "Basis of yarn" , "Texture - strength of character" , "Long fine thread" , "Brief (anag.)" .)

I've seen this clue in The Times.
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