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Polysaccharide; the main constituent of plant cell walls (9)

Ross

I believe the answer is:

cellulose

I believe this is a double definition.

'polysaccharide' is the first definition.
(I know that cellulose is a type of polysaccharide)

'the main constituent of plant cell walls' is the second definition.
(I've seen this before)

(Other definitions for cellulose that I've seen before include "Polysaccharide" , "dietary fibre" , "film-makers use it" , "Substance in plants -- so cull eel (anag)" , "O cull eels for what causes the pitted look" .)

I've seen this clue in The Mirror.
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