Fran —, rugby union prop; 1971 England Test debutant against Scotland (6)
I believe the answer is:
cotton
(Other definitions for cotton that I've seen before include "Plant fibre for fabrics" , "Soft white substance used to make fabric - in song, Old Man River don't plant it" , "Substance like fine wool" , "Fibre including kapok" , "Creamy-white natural fibre" .)