Creamy-white natural fibre (6)
I believe the answer is:
cotton
'creamy-white natural fibre' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for cotton that I've seen before include "Source of cloth" , "Natural textile fibre" , "Creamy-white natural fibre" , "Plantation product" , "Fabric woven from plant fibres" .)