Bit of cotton in one type of fabric (5)
I believe the answer is:
ninon
'fabric' is the definition.
(I've seen this before)
'bit of cotton in one type' is the wordplay.
'bit of' indicates a hidden word.
'NINON' is hidden within 'cotton in one type'.
'of' is the link.
(Other definitions for ninon that I've seen before include "Lightweight silk fabric" , "Fine sheer fabric" , "delicate material" , "fine material" , "thin fabric" .)