Crossword Genius

More or less how old is this dietary fibre? (8)

Ross

I believe the answer is:

roughage

'this dietary fibre?' is the definition.
(I've seen this before)

'more or less how old' is the wordplay.
'more or less' becomes 'rough' (as in a rough estimate).
'how old' becomes 'age' (I've seen this before).
'rough'+'age'='ROUGHAGE'

'is' is the link.

(Other definitions for roughage that I've seen before include "It aids digestion" , "Indigestible fibre" , "Vegetable fibre" , "Coarse food" , "something that can make your passing more bearable" .)

I've seen this clue in The Times.
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